message: Removed old comment
  The function returns an optional, and doesn't throw anymore.
diff: @@ -138,8 +138,6 @@ public:
  *
  * @param[in] landmark_name A landmark name to convert.
  * @return The mapped landmark name if a mapping exists, an empty optional otherwise.
  - * @throws out_of_range exception if there is no mapping
  - * for the given landmarkName.
  */
  std::optional<std::string> convert(std::string landmark_name) const
  {
  