2f1b9432be
So this happens on curves with only a single point in them. If these are converted to the old particle system, we would end up with a particle with only one key (invalid hair), then going to particle editmode would crash. The old particle system took care of this (e.g. when deleting keys in `PARTICLE_OT_delete`) See the following comment: `/* We can't have elements with less than two keys. */` So to resolve, only convert curves with multiple (>1) points in the process. Pull Request: https://projects.blender.org/blender/blender/pulls/118392
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