Fix missing import.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38774 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Tool/ContributionTool.py

@@ -44,6 +44,7 @@ from Products.ERP5Type.Tool.BaseTool import BaseTool
 from Products.ERP5Type import Permissions
 from Products.ERP5 import _dtmldir
 from Products.ERP5.Document.Url import no_crawl_protocol_list, no_host_protocol_list
+from AccessControl import Unauthorized
 
 from zLOG import LOG
 from DateTime import DateTime