admin-full: Add timeserver section if it doesn't already exist in /etc/config/system (#329)

modules/admin-full/luasrc/model/cbi/admin_system/system.lua

@@ -22,7 +22,6 @@ require("luci.config")
 local m, s, o
 local has_ntpd = luci.fs.access("/usr/sbin/ntpd")
 
-
 m = Map("system", translate("System"), translate("Here you can configure the basic aspects of your device like its hostname or the timezone."))
 m:chain("luci")
 
@@ -159,6 +158,20 @@ if has_ntpd then
 	s.anonymous = true
 	s.addremove = false
 
+	function m.on_parse()
+		local has_section = false
+
+		m.uci:foreach("system", "timeserver",
+			function(s)
+				has_section = true
+				return false
+		end)
+
+		if not has_section then
+			m.uci:section("system", "timeserver", "ntp")
+		end
+	end
+
 	o = s:option(Flag, "enable", translate("Enable builtin NTP server"))
 	o.rmempty = false