If all islands had a size of zero, a division by zero would occur in `GEO_uv_parametrizer_pack`, causing the UV coordinates to be set to NaN. An alternative approach would be to skip packing islands with a zero size, but If UV coordinates are for example outside the 0-1 range, it's better if they get moved into that range. Differential Revision: https://developer.blender.org/D14522