Screenshot: create wx app reference only when needed to avoid problems with RIDE.
Screenshot: create wx app reference only when needed to avoid problems with RIDE.

Update issue 1304
Status: Done
Fixed.

fiuba08/robotframework,waldenner/robotframework,ldtri0209/robotframework,fiuba08/robotframework,fiuba08/robotframework,waldenner/robotframework,waldenner/robotframework,ldtri0209/robotframework,ldtri0209/robotframework,ldtri0209/robotframework,waldenner/robotframework,ldtri0209/robotframework,fiuba08/robotframework,fiuba08/robotframework,waldenner/robotframework