Bug: Failure to load meshes using mujoco_importer.py due to failing conditional on line 767

[SageMay]

Thank you for sharing this code, it's super useful. I used it on a different model and wanted to share an issue I encountered.

Description

Used mujoco_importer.py to import a MuJoCo xml to Blender. Armature loaded, but meshes didn't.

Steps to Reproduce

1. My xml prescribed geometries like this: <geom name="mount_plate_001_mesh" type="mesh" material="color_11" mesh="mount_plate"/>
2. Because a class wasn't prescribed, my geoms failed to load meshes. The failure point was line 767, the second half of an 'and' conditional. Specifically, my model returned False to the following: (geom_class == "visual" or geom_class == "visual_light" or geom_class == "visual_dark")
3. I commented out this portion of the conditional. After that it worked perfectly!

Additional Information

I'm new to Blender and MuJoCo, so I don't have a suggestion for the best way to approach this, but want to alert you to the issue in generalizing across new models. Thank you again!