message: add plan_file error checking in parser
diff: @@ -786,6 +786,11 @@ static void create_pipeline_internal(std::unique_ptr<DataReader<TypeKey>>& data_
  plan_file = get_value_from_json<std::string>(j, "plan_file");
  }
  + std::ifstream ifs(plan_file);
  + if(!ifs) {
  + CK_THROW_(Error_t::WrongInput, "plan file " + plan_file + " can bot be open");
  + }
  +
  const SparseEmbeddingHashParams embedding_params = {
  batch_size,
  vocabulary_size,
  