### Godot version

4.0 Beta10

### System information

Ubuntu 22.04 (Tuxedo OS)

### Issue description

After importing an *.obj file as a scene, if you click on the mesh in the import settings Godot crashes.

![Screenshot from 2022-12-24 14-38-23](https://user-images.githubusercontent.com/25522325/209452619-3c0ed61b-deaa-4fb6-8ff5-5aa11ff4ed33.png)

I the above screenshot, clicking in the circled area will crash Godot.

### Steps to reproduce

Import .obj file into a project.
Select the file.
Go to import setting.
Change OBJ As Mesh to Scene.
Click Reimport.
Click Save Scenes, Re-Import, and Restart.
Once restarted, open the advanced import settings on the object.
Click the are circled in the description, or in the meshes tab.

### Minimal reproduction project

N/A

Specifically, I lack the distribution rights of the .obj files I am using.  Any .obj file should do, this happened to me on at least 4 different .obj files.
List<Ref<Mesh>> meshes;
	Error err = _parse_obj(p_path, meshes, false, p_flags & IMPORT_GENERATE_TANGENT_ARRAYS, false, Vector3(1, 1, 1), Vector3(0, 0, 0), r_missing_deps);
	if (err != OK) {
		if (r_err) {
			*r_err = err;
		}
		return nullptr;
	}
	Node3D *scene = memnew(Node3D);
	for (const Ref<Mesh> &m : meshes) {
		Ref<ImporterMesh> mesh;
		mesh.instantiate();
		for (int i = 0; i < m->get_surface_count(); i++) {
			mesh->add_surface(m->surface_get_primitive_type(i), m->surface_get_arrays(i), Array(), Dictionary(), m->surface_get_material(i));
		}
		ImporterMeshInstance3D *mi = memnew(ImporterMeshInstance3D);
		mi->set_mesh(mesh);
		mi->set_name(m->get_name());
		scene->add_child(mi, true);
		mi->set_owner(scene);
	}
	if (r_err) {
		*r_err = OK;
	}
	return scene;
}
void EditorOBJImporter::get_extensions(List<String> *r_extensions) const {