Set default value for TAGS in config_file function to ensure tags are initialized

misc/build.func

@@ -1234,6 +1234,7 @@ config_file() {
   if [[ -n "${TAGS-}" ]]; then
     echo -e "${NETWORK}${BOLD}${DGN}Tags: ${BGN}$TAGS${CL}"
   else
+    TAGS="community-scripts;"
     if ADV_TAGS=$(whiptail --backtitle "Proxmox VE Helper Scripts" --inputbox "Set Custom Tags?[If you remove all, there will be no tags!]" 8 58 "${TAGS}" --title "Advanced Tags" 3>&1 1>&2 2>&3); then
       if [ -n "${ADV_TAGS}" ]; then
         ADV_TAGS=$(echo "$ADV_TAGS" | tr -d '[:space:]')