#2 Deleting last list not reflected in gui until prog restart

[Andrew Petro]

In the case where there is only one list of todo items,
and that list is deleted, this is not reflected in the gui
properly until the application is quit and restarted.

The lists pulldown includes both the list that was
deleted and "no lists found" in this case. The list items
continue to reflect those of that final, deleted list.

Quitting the application and reloading it causes it to
properly reflect that there are no lists.