[Bf-python] crasher in CVS with UV Face Select mode

[Joe Eagar]

Ken Hughes wrote:
> Just came across a way to segfault Blender using the Python API:
>
> If you are in UV Face Select mode and remove the active face, you'll 
> get a segfault when you try to so anything again in the 3D window.  A 
> quick look through the code didn't give me any good ideas how to avoid 
> this: should we switch the 3D window out of edit mode if you delete 
> the object?  Throw an exception?
>
> Ken
Can't you just flag some other face as the active face, and if you run 
out of faces go out of UV Face mode?

Joe