From a1d9b137a298d929caab9fa8556c110489d2b06d Mon Sep 17 00:00:00 2001
From: Claudiu Popa <cpopa@cloudbasesolutions.com>
Date: Fri, 5 Dec 2014 21:49:17 +0200
Subject: Check the return value of slots, it can be None.

---
 checkers/classes.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/checkers/classes.py b/checkers/classes.py
index eeaf689..030bee6 100644
--- a/checkers/classes.py
+++ b/checkers/classes.py
@@ -585,6 +585,8 @@ a metaclass class method.'}
                 return
 
             slots = klass.slots()
+            if slots is None:
+                return
             # If any ancestor doesn't use slots, the slots
             # defined for this class are superfluous.
             if any('__slots__' not in ancestor.locals and
-- 
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