If custom service is selected, no service is actually set in the uci config.
Fallback to custom service if no service is detected in the config.
Fixes#4301
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Fix invalid markup to be XHTML compliant in order to prevent exceptions
when opening DDNS pages with luci-theme-openwrt.
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Ref: https://forum.openwrt.org/t/19-07-luci-app-ddns-broken/57596
Fixes: 34fa5122f ("luci-app-ddns: convert to client side implementatio")
[reword commit message, drop unrelated ui.js changes]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
