message: fix the bug of loading model input/output proto
diff: @@ -213,6 +213,7 @@ ResolvedTestCase LoadSingleTestCase(const UnsolvedTestCase& t) {
  &output_proto, output_data.c_str(), output_data.size());
  proto_test_data.outputs_.emplace_back(std::move(output_proto));
  }
  + st.proto_test_data_.emplace_back(std::move(proto_test_data));
  }
  return st;
  }
  