new: __nonzero__ method for Polytope, Region
new: __nonzero__ method for Polytope, Region

returns True if volume is non-zero

tulip-control/tulip-control,tulip-control/tulip-control,necozay/tulip-control,necozay/tulip-control,necozay/tulip-control,necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control,tulip-control/tulip-control