#2503 make singletons compared with "is" not == or !=
Thanks to Wummel for the patch
diff --git a/Lib/plat-mac/MiniAEFrame.py b/Lib/plat-mac/MiniAEFrame.py
index 6a08dc9..506c5cb 100644
--- a/Lib/plat-mac/MiniAEFrame.py
+++ b/Lib/plat-mac/MiniAEFrame.py
@@ -158,7 +158,7 @@
             #Same try/except comment as above
             rv = _function(**_parameters)
 
-        if rv == None:
+        if rv is None:
             aetools.packevent(_reply, {})
         else:
             aetools.packevent(_reply, {'----':rv})