Add default noname if hostname is empty

Signed-off-by: Christian König <ckoenig@posteo.de>

advanced/Scripts/webpage.sh

@@ -640,7 +640,7 @@ Teleporter() {
     datetimestamp=$(date "+%Y-%m-%d_%H-%M-%S")
     host=$(hostname)
     host="${host//./_}"
-    php /var/www/html/admin/scripts/pi-hole/php/teleporter.php > "pi-hole-${host}-teleporter_${datetimestamp}.tar.gz"
+    php /var/www/html/admin/scripts/pi-hole/php/teleporter.php > "pi-hole-${host:-noname}-teleporter_${datetimestamp}.tar.gz"
 }
 
 checkDomain()