Display Group delete: prevent direct delete of isDisplaySpecific xibosignage/xibo#2844
Display Group delete: prevent direct delete of isDisplaySpecific xibosignage/xibo#2844

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