Null check for window on pointer_axis
Null check for window on pointer_axis

The window is already destroyed and server doesn't get a message yet.

Change-Id: Ia9dd0ce891a712d1aa913fcb3313a5fe300788ab
Reviewed-by: Giulio Camuffo <45605e874bf615bb32ecc5147ce58a7b3b905776@jollamobile.com>
Reviewed-by: Robin Burchell <41fa8c01b8373871178bcfb6b86ab6472317e8dc@viroteck.net>

ntanibata/qtwayland,ntanibata/qtwayland,Tofee/qtwayland,Tofee/qtwayland,ntanibata/qtwayland,Tofee/qtwayland