message: Throw an exception if vertex_indices weren't found
diff: @@ -1401,6 +1401,10 @@ std::shared_ptr<sg::node> vsnray_parser::parse_indexed_triangle_mesh(Object cons
  mesh->vertex_indices.push_back(item.GetInt());
  }
  }
  + else
  + {
  + throw std::runtime_error("");
  + }
  if (obj.HasMember("normal_indices"))
  {
  