Can't check finished consultations

[mrcasals]

Describe the bug
Can't check the finished consultations due to a bug on the permissions system.

To Reproduce
Steps to reproduce the behavior:

1. Go to the consultations list
2. Click on "See previous consultations"
3. Get the error

Expected behavior
No error should be raised.

Screenshots
None.

Stacktrace

NoMethodError (undefined method `published?' for nil:NilClass):

/Users/marc/code/decidim/decidim-consultations/app/permissions/decidim/consultations/permissions.rb:36:in `allowed_public_anonymous_action?'
/Users/marc/code/decidim/decidim-consultations/app/permissions/decidim/consultations/permissions.rb:7:in `permissions'
/Users/marc/code/decidim/decidim-core/app/controllers/concerns/decidim/needs_permission.rb:55:in `block in allowed_to?'
/Users/marc/code/decidim/decidim-core/app/controllers/concerns/decidim/needs_permission.rb:50:in `each'
/Users/marc/code/decidim/decidim-core/app/controllers/concerns/decidim/needs_permission.rb:50:in `inject'
/Users/marc/code/decidim/decidim-core/app/controllers/concerns/decidim/needs_permission.rb:50:in `allowed_to?'
/Users/marc/code/decidim/decidim-core/app/controllers/concerns/decidim/needs_permission.rb:44:in `enforce_permission_to'
/Users/marc/code/decidim/decidim-consultations/app/controllers/decidim/consultations/consultations_controller.rb:34:in `finished'

Extra data (please complete the following information):

• Decidim Version: master
• Decidim installation: Development app

Additional context
None

[mrcasals]

This was closed by #3524.