Traceback (most recent call last):
  File "/usr/share/computerjanitor/computerjanitorapp/gtk/ui.py", line 501, in on_do_button_clicked
    response = AreYouSure(self).verify()
  File "/usr/share/computerjanitor/computerjanitorapp/gtk/dialogs.py", line 85, in verify
    dialog.add_button(ok_button, gtk.RESPONSE_YES)
TypeError: Gtk.Dialog.add_button() argument 1 must be string, not None