If a message does not have object_list, assume that the value is None.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@3878 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/CMFActivity/ActivityTool.py

@@ -92,7 +92,7 @@ class Message:
     return activity_tool.unrestrictedTraverse(self.object_path)
     
   def getObjectList(self, activity_tool):
-    if self.object_list is None:
+    if getattr(self, 'object_list', None) is None:
       try:
         expand_method_id = self.activity_kw['expand_method_id']
         obj = self.getObject(activity_tool)