AttributeError at /api/v0/courses/111/responses/

[redilonka]

Exception when trying to get responses from non existent Course.

Also error has this bug: /api/v0/courses/111/errors/

Traceback:
File "/home/wwwapps/_ve_socraticqs2/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/wwwapps/_ve_socraticqs2/local/lib/python2.7/site-packages/django/views/decorators/csrf.py" in wrapped_view
  58.         return view_func(*args, **kwargs)
File "/home/wwwapps/_ve_socraticqs2/local/lib/python2.7/site-packages/rest_framework/viewsets.py" in view
  83.             return self.dispatch(request, *args, **kwargs)
File "/home/wwwapps/_ve_socraticqs2/local/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
  477.             response = self.handle_exception(exc)
File "/home/wwwapps/_ve_socraticqs2/local/lib/python2.7/site-packages/rest_framework/views.py" in handle_exception
  437.             self.raise_uncaught_exception(exc)
File "/home/wwwapps/_ve_socraticqs2/local/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
  474.             response = handler(request, *args, **kwargs)
File "/home/wwwapps/_ve_socraticqs2/local/lib/python2.7/site-packages/rest_framework/mixins.py" in list
  40.         queryset = self.filter_queryset(self.get_queryset())
File "/home/wwwapps/socraticqs2/mysite/api/v0/views.py" in get_queryset
  20.             self.request, Course.objects.filter(id=self.kwargs.get('course_id')).first()
File "/home/wwwapps/_ve_socraticqs2/local/lib/python2.7/site-packages/rest_framework/views.py" in check_object_permissions
  332.             if not permission.has_object_permission(request, self, obj):
File "/home/wwwapps/socraticqs2/mysite/api/permissions.py" in has_object_permission
  9.         return obj.addedBy == request.user

Exception Type: AttributeError at /api/v0/courses/111/responses/
Exception Value: 'NoneType' object has no attribute 'addedBy'

ER: i'll see error, not exception

[cmltaWt0]

DOD:

HTTP 404 Not Found
Allow: GET, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "detail": "Not found."
}

[DenisKolesnik]

AR:

HTTP 404 Not Found
Allow: GET, OPTIONS
Content-Type: application/json
Vary: Accept

{
"detail": "Not found."
}

Bug has been fixed