From ccdb7257668583d59cc95aa829780c6a4ff38b57 Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Tue, 27 Nov 2007 16:15:32 +0000
Subject: [PATCH] added None to support zope __provides__, [ticket:882]

---
 lib/sqlalchemy/orm/attributes.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/sqlalchemy/orm/attributes.py b/lib/sqlalchemy/orm/attributes.py
index bb713b30ab..9cfee5222a 100644
--- a/lib/sqlalchemy/orm/attributes.py
+++ b/lib/sqlalchemy/orm/attributes.py
@@ -961,7 +961,7 @@ def register_class(class_, extra_init=None, on_exception=None):
     # (like associationproxy) become aware of themselves at the 
     # class level
     for key in dir(class_):
-        getattr(class_, key)
+        getattr(class_, key, None)
     
     oldinit = None
     doinit = False
-- 
2.47.2