Fixed queryset processing for real (another merge fix for pr #279)

polymorphic/query.py

@@ -35,11 +35,13 @@ def _polymorhic_iterator(queryset, base_iter):
     but it requests the objects in chunks from the database,
     with Polymorphic_QuerySet_objects_per_request per chunk
     """
+    while True:
+        base_result_objects = []
+        reached_end = False
+
         # Make sure the base iterator is read in chunks instead of
         # reading it completely, in case our caller read only a few objects.
         for i in range(Polymorphic_QuerySet_objects_per_request):
-        base_result_objects = []
-        reached_end = False
 
             try:
                 o = next(base_iter)