It super nice to have some exceptions raised

but its also a hard: fe a contour with 2 line segments, so no area, would raise an exception for the whole glyph. Visually this contour would always disappear.

https://github.com/typemytype/booleanOperations/blob/master/Lib/booleanOperations/booleanOperationManager.py#L41

In some cases a silent fail is nice. Im unsure what else pyclipper.ClipperException is catching when adding a path.