Fixed bug where user.roles could be passed by bobo as '' or None instead of an...

Fixed bug where user.roles could be passed by bobo as '' or None instead of an empty list, causing 'in' statements to fail

lib/python/AccessControl/User.py

 """Access control package"""
 
-__version__='$Revision: 1.35 $'[11:-2]
+__version__='$Revision: 1.36 $'[11:-2]
 
 
 from PersistentMapping import PersistentMapping
@@ -174,6 +174,7 @@ class UserFolder(Implicit, Persistent, Navigation, Tabs, RoleManager,
 		   title  ='Illegal value', 
                    message='Password and confirmation do not match',
                    action ='manage_main')
+	if not roles: roles=[]
 	if 'Shared' in roles:
             return MessageDialog(
 		   title  ='Illegal value', 
@@ -198,6 +199,7 @@ class UserFolder(Implicit, Persistent, Navigation, Tabs, RoleManager,
 		   title  ='Illegal value', 
                    message='Password and confirmation do not match',
                    action ='manage_main')
+	if not roles: roles=[]
 	if 'Shared' in roles:
             return MessageDialog(
 		   title  ='Illegal value',