message: fix readerv1 unknown prop
diff: @@ -199,7 +199,13 @@ Value RowReaderV1::getValueByName(const std::string& prop) const noexcept {
  Value RowReaderV1::getValueByIndex(const int64_t index) const noexcept {
  + if (index < 0 || static_cast<size_t>(index) >= schema_->getNumFields()) {
  + return Value(NullType::UNKNOWN_PROP);
  + }
  auto vType = getSchema()->getFieldType(index);
  + if (meta::cpp2::PropertyType::UNKNOWN == vType) {
  + return Value(NullType::UNKNOWN_PROP);
  + }
  switch (vType) {
  case meta::cpp2::PropertyType::BOOL:
  return getBool(index);
  