Protection fix for null mediaId in stat returns.
Protection fix for null mediaId in stat returns.

guruevi/xibo-cms,PeterMis/xibo-cms,PeterMis/xibo-cms,dasgarner/xibo-cms,xibosignage/xibo-cms,alexharrington/xibo-cms,ajiwo/xibo-cms,xibosignage/xibo-cms,guruevi/xibo-cms,xibosignage/xibo-cms,ajiwo/xibo-cms,PeterMis/xibo-cms,xibosignage/xibo-cms,guruevi/xibo-cms,yashodhank/xibo-cms,alexharrington/xibo-cms,yashodhank/xibo-cms,PeterMis/xibo-cms,alexharrington/xibo-cms,ajiwo/xibo-cms,yashodhank/xibo-cms,dasgarner/xibo-cms,xibosignage/xibo-cms,dasgarner/xibo-cms,xibosignage/xibo-cms,dasgarner/xibo-cms,dasgarner/xibo-cms,dasgarner/xibo-cms,PeterMis/xibo-cms,alexharrington/xibo-cms,alexharrington/xibo-cms