Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/Alacarte/MainWindow.py", line 417, in on_item_tree_show_toggled
    self.editor.setVisible(item, False)
  File "/usr/lib/python2.5/site-packages/Alacarte/MenuEditor.py", line 205, in setVisible
    self.__addUndo([self.__getMenu(item), item])
  File "/usr/lib/python2.5/site-packages/Alacarte/MenuEditor.py", line 404, in __addUndo
    file_path = os.path.join(util.getUserDirectoryPath(), os.path.split(item.get_desktop_file_path())[1])
  File "/usr/lib/python2.5/posixpath.py", line 77, in split
    i = p.rfind('/') + 1
AttributeError: 'NoneType' object has no attribute 'rfind'