code: public SMailPostalMotorbike findMotorbike(Postcard postcard) {
          final DeliveryCategory category = postcard.getDeliveryCategory().orElse(MAIN_CATEGORY);
          postcard.officeManagedLogging(PostOffice.LOGGING_TITLE_SYSINFO, "category", category.getCategory());
          final SMailPostalMotorbike motorbike = motorbikeMap.get(category);
          if (motorbike == null) {
              String msg = "Not found the motorbike (session) by the category: " + category + ", " + motorbikeMap;
              throw new SMailIllegalStateException(msg);
          }
          return motorbike;
      }
docs: ================