similarly, __of__ has no reason to trigger portal_type loading.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39457 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/dynamic/lazy_class.py

@@ -62,6 +62,7 @@ def generateLazyPortalTypeClass(portal_type_name,
             if attr in ('__class__',
                         '__getnewargs__',
                         '__getstate__',
+                        '__of__',
                         '__dict__',
                         '__module__',
                         '__name__',