wagtail-localize crash when syncing MozFest homepage

[TheoChevalier]

wagtail-localize crashes when trying to sync the MozFest homepage, because it contains a ListBlock nested in StructBlock.
This was fixed in wagtail/wagtail-localize#525, which has been included in 1.1rc2.

2022-03-07T09:03:05.989160+00:00 app[web.2]:   warnings.warn(

2022-03-07T09:03:06.045258+00:00 app[web.2]: Internal Server Error: /cms/localize/update/197/

2022-03-07T09:03:06.045260+00:00 app[web.2]: Traceback (most recent call last):

2022-03-07T09:03:06.045261+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner

2022-03-07T09:03:06.045262+00:00 app[web.2]:     response = get_response(request)

2022-03-07T09:03:06.045263+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response

2022-03-07T09:03:06.045263+00:00 app[web.2]:     response = wrapped_callback(request, *callback_args, **callback_kwargs)

2022-03-07T09:03:06.045264+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/sentry_sdk/integrations/django/views.py", line 67, in sentry_wrapped_callback

2022-03-07T09:03:06.045265+00:00 app[web.2]:     return callback(request, *args, **kwargs)

2022-03-07T09:03:06.045265+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/contextlib.py", line 79, in inner

2022-03-07T09:03:06.045266+00:00 app[web.2]:     return func(*args, **kwds)

2022-03-07T09:03:06.045267+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func

2022-03-07T09:03:06.045267+00:00 app[web.2]:     response = view_func(request, *args, **kwargs)

2022-03-07T09:03:06.045268+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail/admin/urls/__init__.py", line 125, in wrapper

2022-03-07T09:03:06.045268+00:00 app[web.2]:     return view_func(request, *args, **kwargs)

2022-03-07T09:03:06.045268+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail/admin/auth.py", line 174, in decorated_view

2022-03-07T09:03:06.045269+00:00 app[web.2]:     response = view_func(request, *args, **kwargs)

2022-03-07T09:03:06.045269+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/django/views/generic/base.py", line 70, in view

2022-03-07T09:03:06.045270+00:00 app[web.2]:     return self.dispatch(request, *args, **kwargs)

2022-03-07T09:03:06.045270+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/views/update_translations.py", line 161, in dispatch

2022-03-07T09:03:06.045270+00:00 app[web.2]:     return super().dispatch(request, *args, **kwargs)

2022-03-07T09:03:06.045271+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/django/views/generic/base.py", line 98, in dispatch

2022-03-07T09:03:06.045271+00:00 app[web.2]:     return handler(request, *args, **kwargs)

2022-03-07T09:03:06.045271+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/views/update_translations.py", line 115, in post

2022-03-07T09:03:06.045272+00:00 app[web.2]:     return self.form_valid(form)

2022-03-07T09:03:06.045272+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/contextlib.py", line 79, in inner

2022-03-07T09:03:06.045273+00:00 app[web.2]:     return func(*args, **kwds)

2022-03-07T09:03:06.045273+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/views/update_translations.py", line 122, in form_valid

2022-03-07T09:03:06.045274+00:00 app[web.2]:     self.object.update_from_db()

2022-03-07T09:03:06.045274+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/contextlib.py", line 79, in inner

2022-03-07T09:03:06.045274+00:00 app[web.2]:     return func(*args, **kwds)

2022-03-07T09:03:06.045275+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/models.py", line 468, in update_from_db

2022-03-07T09:03:06.045275+00:00 app[web.2]:     self.refresh_segments()

2022-03-07T09:03:06.045275+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/contextlib.py", line 79, in inner

2022-03-07T09:03:06.045276+00:00 app[web.2]:     return func(*args, **kwds)

2022-03-07T09:03:06.045276+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/models.py", line 546, in refresh_segments

2022-03-07T09:03:06.045276+00:00 app[web.2]:     for segment in extract_segments(instance):

2022-03-07T09:03:06.045277+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/segments/extract.py", line 205, in extract_segments

2022-03-07T09:03:06.045277+00:00 app[web.2]:     for segment in StreamFieldSegmentExtractor(

2022-03-07T09:03:06.045277+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/segments/extract.py", line 164, in handle_stream_block

2022-03-07T09:03:06.045278+00:00 app[web.2]:     for segment in self.handle_block(

2022-03-07T09:03:06.045278+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/segments/extract.py", line 97, in handle_block

2022-03-07T09:03:06.045279+00:00 app[web.2]:     return self.handle_struct_block(block_value)

2022-03-07T09:03:06.045279+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/segments/extract.py", line 131, in handle_struct_block

2022-03-07T09:03:06.045279+00:00 app[web.2]:     for segment in self.handle_block(block_type, block_value)

2022-03-07T09:03:06.045279+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/segments/extract.py", line 100, in handle_block

2022-03-07T09:03:06.045280+00:00 app[web.2]:     return self.handle_list_block(block_value, raw_value)

2022-03-07T09:03:06.045280+00:00 app[web.2]:   File "/app/.heroku/python/lib/python3.9/site-packages/wagtail_localize/segments/extract.py", line 145, in handle_list_block

2022-03-07T09:03:06.045280+00:00 app[web.2]:     raw_value["value"][0]

2022-03-07T09:03:06.045281+00:00 app[web.2]: TypeError: 'NoneType' object is not subscriptable