bypass error of a GameObject with a MeshCollider component without a mesh specified

Exporters/Unity 5/EditorToolkit/Assets/Babylon/Source/SceneBuilder.cs

@@ -395,7 +395,17 @@ namespace Unity3D2Babylon
                                 collisionMesh = new BabylonMesh();
                                 collisionMesh.tags = "[MESHCOLLIDER]";
                                 // Generate Mesh Collider Geometry
-                                Tools.GenerateBabylonMeshData(meshCollider.sharedMesh, collisionMesh);
+                               
+                                if(!meshCollider.sharedMesh)
+                                {
+                                    UnityEngine.Debug.LogWarning(meshCollider.gameObject+" has a Mesh Collider component without a mesh");
+                                }
+                                else
+                                {
+                                    Tools.GenerateBabylonMeshData(meshCollider.sharedMesh, collisionMesh);
+                                }
+
+                            
                                 collisionMesh.position = Vector3.zero.ToFloat();
                                 collisionMesh.rotation = Vector3.zero.ToFloat();
                                 float factorX = 1f, factorY = 1f, factorZ = 1f;