# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1480982928 -3600
# Node ID 8eb88c8b40d08258a8115d9c2bb9d55bba99d11a
# Parent  5159c0d73bbf4a12204525402f788359e6906505
Prevent exceptions where classes are investigated as providers of attributes.

diff -r 5159c0d73bbf -r 8eb88c8b40d0 importer.py
--- a/importer.py	Mon Dec 05 18:30:55 2016 +0100
+++ b/importer.py	Tue Dec 06 01:08:48 2016 +0100
@@ -214,7 +214,8 @@
 
         "Return from 'object_type' the details of class attribute 'attrname'."
 
-        attr = self.all_class_attrs[object_type].get(attrname)
+        attrs = self.all_class_attrs.get(object_type)
+        attr = attrs and attrs.get(attrname)
         return attr and self.get_object(attr)
 
     def get_instance_attributes(self, object_type, attrname):