backport of encode#2492 from tomchristie ref encode#1850: _closable_objects as an empty list, not deleted as to prevent cache failures

SuperTango · SuperTango · commit 027e211d0965 · 2015-03-01T22:30:17.000-08:00
diff --git a/rest_framework/response.py b/rest_framework/response.py
@@ -91,4 +91,5 @@ def __getstate__(self):
         for key in ('accepted_renderer', 'renderer_context', 'data'):
             if key in state:
                 del state[key]
+        state['_closable_objects'] = []
         return state
