Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/AppInstall/Menu.py", line 247, in _visible_filter
    not self._activationStyleFilter(item)):
  File "/usr/lib/python2.6/dist-packages/AppInstall/Menu.py", line 337, in _activationStyleFilter
    self.itemIsInstalled(item)):
  File "/usr/lib/python2.6/dist-packages/AppInstall/Menu.py", line 419, in itemIsInstalled
    return (self.cache.has_key(item.pkgname) and
AttributeError: 'NoneType' object has no attribute 'has_key'