@@ -26,7 +26,7 @@ class Grantee(object):

         self.xsi_type = None

         self.tag = None

         self.name = None

-        self.display_name = None

+        self.display_name = ''

         self.permission = None

     def __repr__(self):

@@ -188,8 +188,8 @@ class ACL(object):

         if "ALL" == permission:

             self.grantees = [g for g in self.grantees if not (g.name.lower() == name or g.display_name.lower() == name)]

         else:

-            self.grantees = [g for g in self.grantees if not ((g.display_name.lower() == name and g.permission.upper() == permission)\

-                or (g.name.lower() == name and g.permission.upper() ==  permission))]

+            self.grantees = [g for g in self.grantees if not ((g.display_name.lower() == name or g.name.lower() == name)

+                and g.permission.upper() == permission)]

     def get_printable_tree(self):

         tree = getTreeFromXml(ACL.EMPTY_ACL)