Return empty dict instead of null

ericholscher · ericholscher · commit b586d330b26c · 2019-07-16T18:00:27.000-07:00
diff --git a/readthedocs/search/api.py b/readthedocs/search/api.py
@@ -69,7 +69,7 @@ def _get_inner_hits_highlights(self, hit):
 
             log.debug('API Search highlight: %s', pformat(highlight_dict))
             return highlight_dict
-        return None
+        return {}
 
 
 class PageSearchAPIView(generics.ListAPIView):
