public function populateHelperConfig() {
    $this->set('drush.alias', $this->get('drush.default_alias'));

    if (!$this->get('multisites')) {
      $this->set('multisites', $this->getSiteDirs());
    }

    $multisites = $this->get('multisites');
    $first_multisite = reset($multisites);
    $site = $this->get('site', $first_multisite);
    $this->setSite($site);
  }