Drop useless condition on container being None.

At this point we expect a container as in its sibling '_render_triggers' method.

views/dataobject.py

@@ -84,9 +84,9 @@ class ContainedRelationFacetWidget(rwdg.RelationFacetWidget):
         """
         # first retrieve the container entity
         _, container = parent_and_container(entity)
+        assert container is not None
         # and put it as an extra url param
-        if container is not None:
-            url_params['container'] = text_type(container.eid)
+        url_params['container'] = text_type(container.eid)
         return super(ContainedRelationFacetWidget, self).trigger_search_url(entity, url_params)