Fix occasional double submit on Playlist add form
Fix occasional double submit on Playlist add form

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