Raise same error as in FileStorage when trying to undo a transaction where there

is no previous record for an object.


git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@408 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/app.py

@@ -690,10 +690,11 @@ class Application(object):
         # Second get object data from storage node using loadBefore
         data_dict = {}
         for oid in oid_list:
+            try:
                 result = self.loadBefore(oid, transaction_id)
-            # no previous revision, can't undo
-            if result is None:
-                raise UndoError("non-undoable transaction", oid)
+            except NEOStorageNotFoundError:
+                # no previous revision, can't undo (as in filestorage)
+                raise UndoError("no previous record", oid)
             data, start, end = result
             # end must be TID we are going to undone otherwise it means
             # a later transaction modify the object