`defvert_array_find_weight_safe()` was confusing 'invalid vgroup' and 'valid but totally empty vgroup' cases. Note that this also affected at least ShrinkWrap and SimpleDeform modifiers.
`defvert_array_find_weight_safe()` was confusing 'invalid vgroup' and 'valid but totally empty vgroup' cases. Note that this also affected at least ShrinkWrap and SimpleDeform modifiers.