fix: potentially division by zero in case of no weights

io_scene_ms3d/__init__.py

@@ -23,7 +23,7 @@ bl_info = {
     'description': "Import / Export MilkShape3D MS3D files"\
             " (conform with MilkShape3D v1.8.4)",
     'author': "Alexander Nussbaumer",
-    'version': (0, 95, 0),
+    'version': (0, 95, 1),
     'blender': (2, 65, 3),
     'location': "File > Import & File > Export",
     'warning': "",

io_scene_ms3d/ms3d_export.py

@@ -392,7 +392,10 @@ class Ms3dExporter():
                                 for weight in weights:
                                     weight_sum += weight
 
-                                weight_normalize = 1.0 / weight_sum
+                                if weight_sum > 0.0:
+                                    weight_normalize = 1.0 / weight_sum
+                                else:
+                                    weight_normalize = 1.0
 
                                 weight_sum = 1.0
                                 for index, weight in enumerate(weights):