/**
  * Returns the folder name where to store all news stuff relative to /assets/ directory.
  * If folderperpage extension is installed it is automatically used
  * Falls back to global RootFolderName set in SiteConfig
  *
  * @return string
  */
 private function getRootFolderName(SiteConfig $siteConfig)
 {
     return $this->owner->has_extension('RootFolder') ? $this->owner->getRootFolderName() : $siteConfig->getRootFolderName();
 }