Quote variable so string(TOUPPER ...) doesn't fail when it's empty
Quote variable so string(TOUPPER ...) doesn't fail when it's empty

root-mirror/root,karies/root,root-mirror/root,olifre/root,olifre/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,karies/root,olifre/root,olifre/root,root-mirror/root,karies/root,karies/root,karies/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,olifre/root,karies/root,karies/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,karies/root