TelepathyContacts: Could not request presences: Traceback (most recent call last):
  File "/var/lib/python-support/python2.4/dbus/service.py", line 304, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/lib/python2.4/site-packages/TelepathyButterfly/connection.py", line 344, in RequestPresence
    presence = MsnPresence.pymsn_to_telepathy[ contact.get_property("presence") ]
AttributeError: 'NoneType' object has no attribute 'get_property'