/**
  * Remove Pic from Series
  */
 public function removePicFromSeries(Series $series, $picId)
 {
     $pic = $series->getPicById($picId);
     $picPath = $pic->getPath();
     $picUrl = $pic->getUrl();
     if (in_array('banner', $pic->getTags())) {
         foreach ($this->locales as $locale) {
             if (0 < strpos($series->getHeader($locale), $picUrl)) {
                 $series->setHeader('', $locale);
             }
         }
     }
     $series->removePicById($picId);
     $this->dm->persist($series);
     $this->dm->flush();
     if ($this->forceDeleteOnDisk && $picPath) {
         $this->deleteFileOnDisk($picPath, $series);
     }
     return $series;
 }