/**
  * @param string
  * @return string|NULL
  */
 public function filterOut($vendor)
 {
     $row = $this->addons->findByComposerVendor($vendor)->limit(1)->fetch();
     if (!$row) {
         return NULL;
     }
     $addon = Addon::fromActiveRow($row);
     return $addon->composerVendor;
 }