Mark page.undelete as not implemented.

Bug: 72733
Change-Id: I9d03dd3fe23dfd6bc8487072690b0854ab9a78cd
editor depends on tkinter and idlelib

Catch import error loading tkinter and idlelib.

Bug: 70703
Change-Id: I867c39d3666aef92d9a689caf66dae1567bd8bbb
Merge "Mark page.undelete as not implemented."
Merge "editor depends on tkinter and idlelib"