Remove no-op code.

This was intended to be a raise, but was broken. Anyway, it's not
required for not-committed-yet pack implementation.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2272 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/app.py

@@ -898,9 +898,6 @@ class Application(object):
         else:
             raise NEOStorageError('undo failed')
 
-        if self.local_var.txn_info['packed']:
-            UndoError('non-undoable transaction')
-
         tid = self.local_var.tid
 
         undo_conflict_oid_list = self.local_var.undo_conflict_oid_list = []