glTF importer: fix bug importing file with no mesh / bug with faceless primitives

io_scene_gltf2/__init__.py

@@ -15,7 +15,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (0, 9, 80),
+    "version": (0, 9, 81),
     'blender': (2, 81, 6),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',

io_scene_gltf2/blender/imp/gltf2_blender_gltf.py

@@ -278,7 +278,7 @@ class BlenderGlTF():
                 mesh.is_weight_animated = False
 
         # Calculate names for each mesh's shapekeys
-        for mesh in gltf.data.meshes:
+        for mesh in gltf.data.meshes or []:
             mesh.shapekey_names = []
             used_names = set()
 

io_scene_gltf2/blender/imp/gltf2_blender_primitive.py

@@ -81,7 +81,7 @@ class BlenderPrimitive():
         bme_verts.ensure_lookup_table()
 
         # Add edges/faces to bmesh
-        mode = pyprimitive.mode or 4
+        mode = 4 if pyprimitive.mode is None else pyprimitive.mode
         edges, faces = BlenderPrimitive.edges_and_faces(mode, indices)
         # NOTE: edges and vertices are in terms of pidxs!
         for edge in edges: