Treat all widgets as True.
Treat all widgets as True.

This is convenient for conditionals (``if w`` vs ``if w is not None``)
and normally something you can assume to be true, but Widget implements
__len__() to report the number of children, and python uses __len__() if
__bool__() isn't implemented.  This caused some confusing bugs, so I
implemented __bool__() to simply return True.

kxgames/glooey,kxgames/glooey