ZODB expect the _extension field to be an empty dict when iterating.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1795 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/iterator.py

@@ -99,7 +99,8 @@ class Iterator(object):
         user = txn['user_name']
         desc = txn['description']
         oid_list = txn['oids']
-        txn = Transaction(self.app, tid, ' ', user, desc, None, oid_list)
+        extension = {} # as expected by the ZODB
+        txn = Transaction(self.app, tid, ' ', user, desc, extension, oid_list)
         return txn
 
     def __str__(self):