code: @SuppressWarnings(UNUSED)
      @CheckForNull
      @Exported
      public Run getLastBuild() {
          Run retVal = null;
          for (Job job : getAllJobs()) {
              retVal = takeLast(retVal, job.getLastBuild());
          }
          return retVal;
      }
docs: Returns the last build.
  
  @return the build or null