message: Handle transformMatrix: null (e.g. in isIronwoodB)
diff: @@ -315,11 +315,14 @@ void load_moana(std::string const& filename, model& mod)
  // transformMatrix
  int i = 0;
  rapidjson::Value const& tm = doc["transformMatrix"];
  + if (tm.IsArray())
  + {
  for (auto& item : tm.GetArray())
  {
  base_transform->matrix().data()[i++] = item.GetFloat();
  assert(i <= 16);
  }
  + }
  // geomObjFile
  