Fix Error page handlers. Prod

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.9/site-packages/django/utils/deprecation.py", line 117, in __call__
    response = response or self.get_response(request)
  File "/usr/local/lib/python3.9/site-packages/django/core/handlers/exception.py", line 49, in inner
    response = response_for_exception(request, exc)
  File "/usr/local/lib/python3.9/site-packages/django/core/handlers/exception.py", line 114, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/usr/local/lib/python3.9/site-packages/django/core/handlers/exception.py", line 153, in handle_uncaught_exception
    return callback(request)
  File "/marketplace-portal/marketplace_portal/views.py", line 79, in handler500
    if "exception" not in argv and request.user.is_authenticated and request.user.is_staff:
AttributeError: 'FakeUser' object has no attribute 'is_authenticated'