ERP5Type.Accessor.Category.Tester should not acquire, to be consistent with Base.Tester.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31740 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Accessor/Category.py

@@ -219,5 +219,5 @@ class Tester(ListGetter):
   """Tests if the category is set.
   """
   def __call__(self, instance, *args, **kw):
-    return bool(ListGetter.__call__(self, instance, *args, **kw))
+    return bool(instance._getCategoryMembershipList(self._key, **kw))