Filter out frames without versions using python, rather than the ORM

This is much more efficient and preserves order

archive/frames/tests/test_views.py

@@ -73,7 +73,7 @@ def test_get_frame_list_exclude_empty_version_set(self):
         response = self.client.get(reverse('frame-list'))
         self.assertEqual(frame.version_set.count(), 0)
         self.assertEqual(Frame.objects.count(), 6)
-        self.assertEqual(response.json()['count'], 5)
+        self.assertEqual(len(response.json()['results']), 5)
 
 
 class TestFramePost(ReplicationTestCase):

archive/frames/views.py

@@ -89,6 +89,7 @@ def list(self, request, *args, **kwargs):
         page = self.paginate_queryset(queryset)
         include_thumbnails = True if request.query_params.get('include_thumbnails', '').lower() == 'true' else False
         json_models = [model.as_dict(include_thumbnails) for model in page]
+        json_models = [model for model in json_models if model['version_set']]  # Filter out frames with no versions
         return self.get_paginated_response(json_models)
 
     def retrieve(self, request, *args, **kwargs):