fixed context_key

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@813 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/CMFCategory/CategoryTool.py

@@ -756,7 +756,7 @@ class CategoryTool( UniqueObject, Folder, Base ):
       if acquired_object_dict is None:
         acquired_object_dict = {}
       else:
-        context_key = (context.getPhysicalPath(), base_category, portal_type) # Prevents recursion in category acquisition
+        context_key = (context.getPhysicalPath(), base_category, tuple(portal_type)) # Prevents recursion in category acquisition
         if context_key in acquired_object_dict:
           # Stop recursion if this object if already used
           return []