/**
  * Removes deleted nodes of a given tree from node repository
  *
  * @param Tx_PtExtbase_Tree_NestedSetTreeInterface $tree Tree whose deleted nodes should be removed from repository
  */
 protected function removeDeletedNodesOfGivenTree(Tx_PtExtbase_Tree_NestedSetTreeInterface $tree)
 {
     foreach ($tree->getDeletedNodes() as $deletedNode) {
         $this->nodeRepository->remove($deletedNode);
     }
 }