Skip empty material slots on a Mesh

They may occur if materials are intended to be supplied by the object
instead of the mesh.

diff --git a/blender/io_mspgl/mesh.py b/blender/io_mspgl/mesh.py
index 8ad77bdafed3111e582578f2d885e3dfafb935f6..c0d9c11b872ee6e079e52dbb7d97648ec88c81fa 100644 (file)
--- a/blender/io_mspgl/mesh.py
+++ b/blender/io_mspgl/mesh.py
@@ -194,6 +194,8 @@ class Mesh:
                has_normal_maps = False
                splat_material = None
                for m in self.materials:
+                       if not m:
+                               continue
                        mat = Material(m)
                        for p in itertools.chain(mat.properties, *(s.properties for s in mat.sub_materials)):
                                if p.tex_keyword=="normal_map" and p.texture: