action['category'] may be None.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@45083 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/ERP5Type.py

@@ -568,7 +568,8 @@ class ERP5TypeInformation(XMLObject,
       ec = createExpressionContext(ob)
       other_action = None
       for action in self.getActionList():
-        if action['id'] == view or action['category'].endswith('_' + view):
+        if action['id'] == view or (action['category'] is not None and
+                                    action['category'].endswith('_' + view)):
           if action.test(ec):
             break
         elif other_action is None: