Importing exported Excel fails

[carlobeltrame]

When importing the following excel file:
Grundplattform zusätzlich.xlsx
using the latest git commit version of term customizer (remote: https://github.com/mainio/decidim-module-term_customizer.git, revision: 0046905fff1fbf24ff721a8d8c30e2b767c448fb, ref: develop), we get the following error:

NoMethodError: undefined method `value' for nil:NilClass
  from decidim-module-term_customizer (0046905fff1f) lib/decidim/term_customizer/import/readers/xlsx.rb:18:in `map'
  from decidim-module-term_customizer (0046905fff1f) lib/decidim/term_customizer/import/readers/xlsx.rb:18:in `block in read_rows'
  from rubyXL (3.4.24) lib/rubyXL/worksheet.rb:23:in `block in each'
  from rubyXL (3.4.24) lib/rubyXL/worksheet.rb:23:in `each'
  from rubyXL (3.4.24) lib/rubyXL/worksheet.rb:23:in `each'
  from decidim-module-term_customizer (0046905fff1f) lib/decidim/term_customizer/import/readers/xlsx.rb:17:in `each_with_index'
  from decidim-module-term_customizer (0046905fff1f) lib/decidim/term_customizer/import/readers/xlsx.rb:17:in `read_rows'
  from decidim-module-term_customizer (0046905fff1f) lib/decidim/term_customizer/import/importer.rb:52:in `collection_data'
  from decidim-module-term_customizer (0046905fff1f) lib/decidim/term_customizer/import/importer.rb:40:in `collection'
  from decidim-module-term_customizer (0046905fff1f) lib/decidim/term_customizer/import/importer.rb:31:in `block in import'
  from activerecord (6.0.5) lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `block in transaction'
  from activerecord (6.0.5) lib/active_record/connection_adapters/abstract/transaction.rb:280:in `block in within_new_transaction'
  from activesupport (6.0.5) lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
  from activesupport (6.0.5) lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
  from activesupport (6.0.5) lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
  from activesupport (6.0.5) lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
  from activesupport (6.0.5) lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
  from activerecord (6.0.5) lib/active_record/connection_adapters/abstract/transaction.rb:278:in `within_new_transaction'
  from activerecord (6.0.5) lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `transaction'
  from activerecord (6.0.5) lib/active_record/transactions.rb:212:in `transaction'
  from decidim-module-term_customizer (0046905fff1f) lib/decidim/term_customizer/import/importer.rb:29:in `import'
  from decidim-module-term_customizer (0046905fff1f) app/commands/decidim/term_customizer/admin/import_set_translations.rb:70:in `import_file'
  from decidim-module-term_customizer (0046905fff1f) app/commands/decidim/term_customizer/admin/import_set_translations.rb:57:in `import_translations'
  from decidim-module-term_customizer (0046905fff1f) app/commands/decidim/term_customizer/admin/import_set_translations.rb:34:in `call'
  from rectify (0.13.0) lib/rectify/command.rb:30:in `call'
  from decidim-module-term_customizer (0046905fff1f) app/controllers/decidim/term_customizer/admin/translations_controller.rb:109:in `import'
  from actionpack (6.0.5) lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
  from actionpack (6.0.5) lib/abstract_controller/base.rb:195:in `process_action'
  from actionpack (6.0.5) lib/action_controller/metal/rendering.rb:30:in `process_action'
  from actionpack (6.0.5) lib/abstract_controller/callbacks.rb:42:in `block in process_action'
  from activesupport (6.0.5) lib/active_support/callbacks.rb:112:in `block in run_callbacks'
  from activesupport (6.0.5) lib/active_support/core_ext/time/zones.rb:66:in `use_zone'
  from decidim-core (0.26.1) app/controllers/concerns/decidim/use_organization_time_zone.rb:21:in `use_organization_time_zone'
  from activesupport (6.0.5) lib/active_support/callbacks.rb:121:in `block in run_callbacks'
  from i18n (1.10.0) lib/i18n.rb:328:in `with_locale'
  from decidim-core (0.26.1) app/controllers/concerns/decidim/locale_switcher.rb:24:in `switch_locale'
  from activesupport (6.0.5) lib/active_support/callbacks.rb:121:in `block in run_callbacks'
  from sentry-raven (3.1.2) lib/raven/integrations/rails/controller_transaction.rb:7:in `block in included'
  from activesupport (6.0.5) lib/active_support/callbacks.rb:121:in `instance_exec'
  from activesupport (6.0.5) lib/active_support/callbacks.rb:121:in `block in run_callbacks'
  from activesupport (6.0.5) lib/active_support/callbacks.rb:139:in `run_callbacks'
  from actionpack (6.0.5) lib/abstract_controller/callbacks.rb:41:in `process_action'
  from actionpack (6.0.5) lib/action_controller/metal/rescue.rb:22:in `process_action'
  from actionpack (6.0.5) lib/action_controller/metal/instrumentation.rb:33:in `block in process_action'
  from activesupport (6.0.5) lib/active_support/notifications.rb:180:in `block in instrument'
  from activesupport (6.0.5) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
  from activesupport (6.0.5) lib/active_support/notifications.rb:180:in `instrument'
  from actionpack (6.0.5) lib/action_controller/metal/instrumentation.rb:32:in `process_action'
  from actionpack (6.0.5) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
  from activerecord (6.0.5) lib/active_record/railties/controller_runtime.rb:27:in `process_action'
  from actionpack (6.0.5) lib/abstract_controller/base.rb:136:in `process'
  from actionview (6.0.5) lib/action_view/rendering.rb:39:in `process'
  from actionpack (6.0.5) lib/action_controller/metal.rb:190:in `dispatch'
  from actionpack (6.0.5) lib/action_controller/metal.rb:254:in `dispatch'
  from actionpack (6.0.5) lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
  from actionpack (6.0.5) lib/action_dispatch/routing/route_set.rb:33:in `serve'
  from actionpack (6.0.5) lib/action_dispatch/journey/router.rb:49:in `block in serve'
  from actionpack (6.0.5) lib/action_dispatch/journey/router.rb:32:in `each'
  from actionpack (6.0.5) lib/action_dispatch/journey/router.rb:32:in `serve'
  from actionpack (6.0.5) lib/action_dispatch/routing/route_set.rb:834:in `call'
  from railties (6.0.5) lib/rails/engine.rb:527:in `call'
  from railties (6.0.5) lib/rails/railtie.rb:190:in `public_send'
  from railties (6.0.5) lib/rails/railtie.rb:190:in `method_missing'
  from actionpack (6.0.5) lib/action_dispatch/routing/mapper.rb:19:in `block in <class:Constraints>'
  from actionpack (6.0.5) lib/action_dispatch/routing/mapper.rb:48:in `serve'
  from actionpack (6.0.5) lib/action_dispatch/journey/router.rb:49:in `block in serve'
  from actionpack (6.0.5) lib/action_dispatch/journey/router.rb:32:in `each'
  from actionpack (6.0.5) lib/action_dispatch/journey/router.rb:32:in `serve'
  from actionpack (6.0.5) lib/action_dispatch/routing/route_set.rb:834:in `call'
  from railties (6.0.5) lib/rails/engine.rb:527:in `call'
  from railties (6.0.5) lib/rails/railtie.rb:190:in `public_send'
  from railties (6.0.5) lib/rails/railtie.rb:190:in `method_missing'
  from actionpack (6.0.5) lib/action_dispatch/routing/mapper.rb:19:in `block in <class:Constraints>'
  from actionpack (6.0.5) lib/action_dispatch/routing/mapper.rb:48:in `serve'
  from actionpack (6.0.5) lib/action_dispatch/journey/router.rb:49:in `block in serve'
  from actionpack (6.0.5) lib/action_dispatch/journey/router.rb:32:in `each'
  from actionpack (6.0.5) lib/action_dispatch/journey/router.rb:32:in `serve'
  from actionpack (6.0.5) lib/action_dispatch/routing/route_set.rb:834:in `call'
  from batch-loader (1.5.0) lib/batch_loader/middleware.rb:11:in `call'
  from rack-attack (6.6.1) lib/rack/attack.rb:127:in `call'
  from omniauth (2.1.0) lib/omniauth/strategy.rb:202:in `call!'
  from omniauth (2.1.0) lib/omniauth/strategy.rb:169:in `call'
  from omniauth (2.1.0) lib/omniauth/strategy.rb:202:in `call!'
  from omniauth (2.1.0) lib/omniauth/strategy.rb:169:in `call'
  from omniauth (2.1.0) lib/omniauth/strategy.rb:202:in `call!'
  from omniauth (2.1.0) lib/omniauth/strategy.rb:169:in `call'
  from omniauth (2.1.0) lib/omniauth/builder.rb:44:in `call'
  from warden (1.2.9) lib/warden/manager.rb:36:in `block in call'
  from warden (1.2.9) lib/warden/manager.rb:34:in `catch'
  from warden (1.2.9) lib/warden/manager.rb:34:in `call'
  from decidim-core (0.26.1) lib/decidim/middleware/strip_x_forwarded_host.rb:12:in `call'
  from decidim-module-decidim_awesome (658d226e9ed1) app/middleware/decidim/decidim_awesome/current_config.rb:33:in `call'
  from decidim-core (0.26.1) lib/decidim/middleware/current_organization.rb:22:in `call'
  from rack (2.2.3) lib/rack/tempfile_reaper.rb:15:in `call'
  from rack (2.2.3) lib/rack/etag.rb:27:in `call'
  from rack (2.2.3) lib/rack/conditional_get.rb:40:in `call'
  from rack (2.2.3) lib/rack/head.rb:12:in `call'
  from actionpack (6.0.5) lib/action_dispatch/http/content_security_policy.rb:18:in `call'
  from rack (2.2.3) lib/rack/session/abstract/id.rb:266:in `context'
  from rack (2.2.3) lib/rack/session/abstract/id.rb:260:in `call'
  from actionpack (6.0.5) lib/action_dispatch/middleware/cookies.rb:654:in `call'
  from actionpack (6.0.5) lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
  from activesupport (6.0.5) lib/active_support/callbacks.rb:101:in `run_callbacks'
  from actionpack (6.0.5) lib/action_dispatch/middleware/callbacks.rb:26:in `call'
  from actionpack (6.0.5) lib/action_dispatch/middleware/actionable_exceptions.rb:18:in `call'
  from actionpack (6.0.5) lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call'
  from actionpack (6.0.5) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
  from lograge (0.12.0) lib/lograge/rails_ext/rack/logger.rb:18:in `call_app'
  from railties (6.0.5) lib/rails/rack/logger.rb:26:in `block in call'
  from activesupport (6.0.5) lib/active_support/tagged_logging.rb:80:in `block in tagged'
  from activesupport (6.0.5) lib/active_support/tagged_logging.rb:28:in `tagged'
  from activesupport (6.0.5) lib/active_support/tagged_logging.rb:80:in `tagged'
  from railties (6.0.5) lib/rails/rack/logger.rb:26:in `call'
  from actionpack (6.0.5) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
  from request_store (1.5.1) lib/request_store/middleware.rb:19:in `call'
  from actionpack (6.0.5) lib/action_dispatch/middleware/request_id.rb:27:in `call'
  from rack (2.2.3) lib/rack/method_override.rb:24:in `call'
  from activesupport (6.0.5) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
  from actionpack (6.0.5) lib/action_dispatch/middleware/executor.rb:14:in `call'
  from rack (2.2.3) lib/rack/sendfile.rb:110:in `call'
  from actionpack (6.0.5) lib/action_dispatch/middleware/host_authorization.rb:97:in `call'
  from sentry-raven (3.1.2) lib/raven/integrations/rack.rb:51:in `call'
  from prometheus_exporter (2.0.2) lib/prometheus_exporter/middleware.rb:34:in `call'
  from rack-cors (1.1.1) lib/rack/cors.rb:100:in `call'
  from railties (6.0.5) lib/rails/engine.rb:527:in `call'
  from puma (5.6.4) lib/puma/configuration.rb:252:in `call'
  from puma (5.6.4) lib/puma/request.rb:77:in `block in handle_request'
  from puma (5.6.4) lib/puma/thread_pool.rb:340:in `with_force_shutdown'
  from puma (5.6.4) lib/puma/request.rb:76:in `handle_request'
  from puma (5.6.4) lib/puma/server.rb:441:in `process_client'
  from puma (5.6.4) lib/puma/thread_pool.rb:147:in `block in spawn_thread'

We are using decidim 0.26.1.