Catalog call might raise exceptions.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5555 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Security/ERP5GroupManager.py

@@ -102,8 +102,11 @@ class ERP5GroupManager(BasePlugin):
         security_definition_list = mapping_method()
 
       # get the person from its reference
-      catalog_result = self.portal_catalog(
-          portal_type="Person", reference=user_name)
+      try:
+        catalog_result = self.portal_catalog(
+            portal_type="Person", reference=user_name)
+      except AttributeError:
+        return []
       if len(catalog_result) != 1: # we won't proceed with groups
         if len(catalog_result) > 1: # configuration is screwed
           raise 'ConsistencyError', 'There is more than one Person whose \