AttributeError when dashboard is opened in region without default language

[timobrembeck]

Describe the Bug

Steps to Reproduce

1. Go to A region without default language
2. See error

Expected Behavior

The dashboard should show anyways

Actual Behavior

AttributeError at /testumgebung/

'NoneType' object has no attribute 'slug'

Additional Information

This is a regression of #2767.

Traceback

Environment:


Request Method: GET
Request URL: http://localhost:8000/testumgebung/

Django Version: 4.2.13
Python Version: 3.11.9
Installed Applications:
['integreat_cms.cms',
'integreat_cms.core',
'integreat_cms.deepl_api',
'integreat_cms.google_translate_api',
'integreat_cms.firebase_api',
'integreat_cms.gvz_api',
'integreat_cms.matomo_api',
'integreat_cms.nominatim_api',
'integreat_cms.summ_ai_api',
'integreat_cms.textlab_api',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.humanize',
'django.contrib.messages',
'django.contrib.sessions',
'django.contrib.sitemaps',
'django.contrib.staticfiles',
'corsheaders',
'db_mutex',
'import_export',
'linkcheck',
'polymorphic',
'rules.apps.AutodiscoverRulesConfig',
'treebeard',
'webpack_loader',
'widget_tweaks',
'cacheops',
'django.contrib.admin',
'debug_toolbar']
Installed Middleware:
['django.middleware.gzip.GZipMiddleware',
'debug_toolbar.middleware.DebugToolbarMiddleware',
'corsheaders.middleware.CorsMiddleware',
'django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.locale.LocaleMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'integreat_cms.core.middleware.RegionMiddleware',
'integreat_cms.core.middleware.AccessControlMiddleware',
'integreat_cms.core.middleware.TimezoneMiddleware',
'integreat_cms.api.middleware.JsonDebugToolbarMiddleware']



Traceback (most recent call last):
File "/home/timo/job/integreat/integreat-cms/.venv/lib/python3.11/site-packages/django/core/handlers/exception.py", line 55, in inner
  response = get_response(request)
             ^^^^^^^^^^^^^^^^^^^^^
File "/home/timo/job/integreat/integreat-cms/.venv/lib/python3.11/site-packages/django/core/handlers/base.py", line 197, in _get_response
  response = wrapped_callback(request, *callback_args, **callback_kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/timo/job/integreat/integreat-cms/.venv/lib/python3.11/site-packages/django/views/generic/base.py", line 104, in view
  return self.dispatch(request, *args, **kwargs)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/timo/job/integreat/integreat-cms/.venv/lib/python3.11/site-packages/django/views/generic/base.py", line 143, in dispatch
  return handler(request, *args, **kwargs)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/timo/job/integreat/integreat-cms/.venv/lib/python3.11/site-packages/django/views/generic/base.py", line 226, in get
  context = self.get_context_data(**kwargs)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/timo/job/integreat/integreat-cms/integreat_cms/cms/views/dashboard/dashboard_view.py", line 69, in get_context_data
  context.update(self.get_drafted_pages())
                 ^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/timo/job/integreat/integreat-cms/integreat_cms/cms/views/dashboard/dashboard_view.py", line 242, in get_drafted_pages
  language__slug=self.request.region.default_language.slug,
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Exception Type: AttributeError at /testumgebung/
Exception Value: 'NoneType' object has no attribute 'slug'

[MizukiTemma]

FYI: It seems the region Tesumgebung in the test data has a language but you can reproduce the reported bug if you simply delete the language and try to come back to the dashboard.