916c4fcdac
Importing `COLLADAFW::MeshPrimitive::LINES` would assert trying to get
the `material_indices` (these are on the Face Domain -- which does not
exist here).
To resolve, early out if we know we handle LINES.
Probably didnt happen before 45cff837bc
Stumbled over this looking into !120737
Pull Request: https://projects.blender.org/blender/blender/pulls/120738