using DebugLibrary tries to import Tkinter

[boakley]

If you're running pybot with something other than cpython (or a version of cpython that doesn't have Tkinter installed), trying to use DebugLibrary yields this result:

[ ERROR ] Error in file 'c:\whatever\example.txt' in table 'Settings': Importing test library 'rwb.DebugLibrary' failed: ImportError: No module named Tkinter

Likewise, trying to use socket_listener gives the same sort of problem.

This is caused by some poorly defined modules that import other things that use Tkinter, even if those other things are never instantiated.