public function getVersion($fvID = null)
    {
        if (!$fvID) {
            return $this->getApprovedVersion();
        }

        $em = \ORM::entityManager();
        $r = $em->getRepository('\Concrete\Core\Entity\File\Version');

        return $r->findOneBy(['file' => $this, 'fvID' => $fvID]);
    }