Internal server error when creating new page translations

[timobrembeck]

Describe the Bug

The page form throws an internal server error when the translation does not yet exist

Steps to Reproduce

1. Go to a page form where the translation does not yet exist
2. See error

Expected Behavior

A new translation form should be opened

Actual Behavior

An internal server error occurs

Additional Information

Traceback

Sep 13 08:33:31 ERROR   django.request - Internal Server Error: /lahndillkreis/pages/fr/5665/edit/
Traceback (most recent call last):
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
  response = get_response(request)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response
  response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/views/generic/base.py", line 70, in view
  return self.dispatch(request, *args, **kwargs)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/utils/decorators.py", line 43, in _wrapper
  return bound_method(*args, **kwargs)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/contrib/auth/decorators.py", line 21, in _wrapped_view
  return view_func(request, *args, **kwargs)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/views/generic/base.py", line 98, in dispatch
  return handler(request, *args, **kwargs)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/integreat_cms/cms/views/pages/page_form_view.py", line 92, in get
  if page_translation.status != status.PUBLIC:
AttributeError: 'NoneType' object has no attribute 'status'