Labelme crashes when deleting some points

When annotating an image, labelme will sometimes crash if I delete a point on a polygon/linestrip/etc. It doesn't always happen but happens enough that it is noticeable.

Start by reproducing the crash in the annotation UI while deleting points from polygons and linestrips, noting which shapes and point positions trigger it. Trace the delete-point interaction from the relevant annotation entry point; done means deleting points no longer crashes and the edited shape remains usable.

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