fix empty set

lucemia · lucemia · commit 79ff1a35d1b0 · 2014-12-03T15:43:01.000+08:00
diff --git a/gcloud/datastore/connection.py b/gcloud/datastore/connection.py
@@ -407,6 +407,9 @@ def save_entity(self, dataset_id, key_pb, properties,
         insert.key.CopyFrom(key_pb)
 
         for name, value in properties.items():
+            if isinstance(value, list) and len(value) == 0:
+                continue
+
             prop = insert.property.add()
             # Set the name of the property.
             prop.name = name
