code: public Optional<User> getOptionalUser(int userId) {
          try {
              return (Optional.ofNullable(getUser(userId)));
          } catch (GitLabApiException glae) {
              return (GitLabApi.createOptionalFromException(glae));
          }
      }
docs: Get a single user as an Optional instance.
  
  <pre><code>GitLab Endpoint: GET /users/:id</code></pre>
  
  @param userId the ID of the user to get
  @return the User for the specified user ID as an Optional instance