Fix when only login is provided

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5510 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Security/ERP5UserManager.py

@@ -119,6 +119,8 @@ class ERP5UserManager(BasePlugin):
 
         _enumerateUsers = CachingMethod(_enumerateUsers, id='ERP5UserManager_enumerateUsers')
 
+        if id is None:
+          id = login
         if isinstance(id, str):
           id = (id,)
         if isinstance(id, list):