message: Treat the case where the LSTM builtin options is missing as an error while parsing op data
diff: @@ -435,6 +435,9 @@ TfLiteStatus ParseOpData(const Operator* op, BuiltinOperator op_type,
  lstm_params->kernel_type());
  return kTfLiteError;
  }
  + } else {
  + error_reporter->Report("No valid LSTM builtin options exist");
  + return kTfLiteError;
  }
  *builtin_data = reinterpret_cast<void*>(params.release());
  break;
  