Fix media factory for 0 datasets in unused media query xibosignage/xibo#1182
Fix media factory for 0 datasets in unused media query
xibosignage/xibo#1182

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