Fix setting IsHole property of PyPolyNode
Fix setting IsHole property of PyPolyNode

JesseCrocker/pyclipper,greginvm/pyclipper,anthrotype/pyclipper,anthrotype/pyclipper,anthrotype/pyclipper,greginvm/pyclipper,JesseCrocker/pyclipper,greginvm/pyclipper