Fix T67673: Import .obj with more than one unnamed object fails.

Referenced by issue blender/blender#67673, Import .obj with more than one unnamed object fails.

io_scene_obj/__init__.py

@@ -21,7 +21,7 @@
 bl_info = {
     "name": "Wavefront OBJ format",
     "author": "Campbell Barton, Bastien Montagne",
-    "version": (3, 5, 10),
+    "version": (3, 5, 11),
     "blender": (2, 80, 0),
     "location": "File > Import-Export",
     "description": "Import-Export OBJ, Import OBJ mesh, UV's, materials and textures",

io_scene_obj/import_obj.py

@@ -915,6 +915,8 @@ def load(context,
     """
     def unique_name(existing_names, name_orig):
         i = 0
+        if name_orig is None:
+            name_orig = b"ObjObject"
         name = name_orig
         while name in existing_names:
             name = b"%s.%03d" % (name_orig, i)