the import of sys was missing

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4520 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/patches/Transaction.py

@@ -13,6 +13,8 @@
 #
 ##############################################################################
 
+import sys
+
 # Adding commit_prepare to the zodb transaction
 try:
     from ZODB import Transaction, POSException