code: public void registerProblem(GitHubRepositoryName repo, Throwable throwable) {
          if (throwable == null) {
              return;
          }
          registerProblem(repo, throwable.getMessage());
      }
docs: Registers problems. For message {@link Throwable#getMessage()} will be used
  
  @param repo      full named GitHub repo, if null nothing will be done
  @param throwable exception with message about problem, if null nothing will be done
  
  @see #registerProblem(GitHubRepositoryName, String)