message: fix cannot serialize 'false' value
diff: @@ -389,11 +389,8 @@ template<>
  struct ApiClient::TypeInterpretation<oatpp::Boolean> {
  static oatpp::String toString(const oatpp::String &typeName, const oatpp::Boolean &parameter) {
  (void) typeName;
  - if (parameter) {
  return utils::conversion::boolToStr(*parameter);
  }
  - return nullptr;
  - }
  };
  template<class T, class I>
  