/**
  * Check if the media rule should be included
  *
  * @param  \Crossjoin\Css\Format\Rule\AtMedia\MediaQuery  $media_query
  * @return bool
  */
 protected function isAllowedMediaRule(MediaQuery $media_query)
 {
     $type = $media_query->getType();
     $condition = count($media_query->getConditions());
     return ($type === MediaQuery::TYPE_ALL || $type === MediaQuery::TYPE_SCREEN) && $condition === 0;
 }