public function showLeadershipBlock($leaders, $extended_registration = FALSE) {
    if (!empty($leaders)) {
      $output = [
        '#theme' => 'openy_campaign_leadership',
        '#leaders' => $leaders,
        '#extended_registration' => $extended_registration,
      ];
    }
    else {
      $config = $this->config('openy_campaign.general_settings');
      $output = [
        '#prefix' => '<div class="leadership-no-results">',
        '#markup' => $config->get('activities_count_no_results_message'),
        '#suffix' => '</div>',
      ];
    }

    $render = $this->renderer->render($output);

    return $render;
  }