only send notification if email defined

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@664 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/CMFActivity/ActivityTool.py

@@ -130,6 +130,7 @@ class Message:
 
   def notifyUser(self, activity_tool, message="Failed Processing Activity"):
     user_email = activity_tool.portal_memberdata.getProperty('email')
+    if user_email:
       mail_text = """From: %s
 To: %s
 Subject: %s