[pitivi] reciever: use is to compare with None, using != throws exception in some cases

[Edward Hervey <edwardrv src gnome org>]

commit 044dad4bc216fd6e85178990252f38e5de74f8c3
Author: Brandon Lewis <brandon_lewis berkeley edu>
Date:   Fri May 29 16:38:48 2009 -0700

    reciever: use is to compare with None, using != throws exception in some cases

 pitivi/receiver.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/receiver.py b/pitivi/receiver.py
index 078163b..f044777 100644
--- a/pitivi/receiver.py
+++ b/pitivi/receiver.py
@@ -40,7 +40,7 @@ class receiver(object):
                 instance._receiver_data[self].sender.disconnect(sid)
             rd.sender = None
             rd.sigids = {}
-        if value != None:
+        if not (value is None):
             for sig, hdlr in self.handlers.iteritems():
                 rd.sigids[sig] = value.connect(sig, MethodType(hdlr,
                     instance))