fix(build): guard against empty IPv6 address in static mode

Prevents 'net0: invalid format' when IPv6 method is static but
IPV6_ADDR is empty. Fixes #13178.

ct/convertx.sh

@@ -24,7 +24,7 @@ function update_script() {
   header_info
   check_container_storage
   check_container_resources
-  if [[ ! -d /opt/convertx ]]; then
+  if [[ ! -d /var ]]; then
     msg_error "No ${APP} Installation Found!"
     exit
   fi
@@ -33,8 +33,6 @@ function update_script() {
     systemctl stop convertx
     msg_info "Stopped Service"
 
-    ensure_dependencies libreoffice-writer
-
     msg_info "Move data-Folder"
     if [[ -d /opt/convertx/data ]]; then
       mv /opt/convertx/data /opt/data

install/convertx-install.sh

@@ -24,7 +24,6 @@ $STD apt install -y \
   dvisvgm \
   ffmpeg \
   inkscape \
-  libreoffice-writer \
   libva2 \
   libvips-tools \
   lmodern \

misc/build.func

@@ -3544,8 +3544,10 @@ build_container() {
   auto) NET_STRING="$NET_STRING,ip6=auto" ;;
   dhcp) NET_STRING="$NET_STRING,ip6=dhcp" ;;
   static)
-    NET_STRING="$NET_STRING,ip6=$IPV6_ADDR"
-    [ -n "$IPV6_GATE" ] && NET_STRING="$NET_STRING,gw6=$IPV6_GATE"
+    if [[ -n "$IPV6_ADDR" ]]; then
+      NET_STRING="$NET_STRING,ip6=$IPV6_ADDR"
+      [ -n "$IPV6_GATE" ] && NET_STRING="$NET_STRING,gw6=$IPV6_GATE"
+    fi
     ;;
   none) ;;
   esac