luci-app-travelmate: bugfix add/editing WPA3 uplinks

* see forum post
https://forum.openwrt.org/t/travelmate-support-thread/5155/318

Signed-off-by: Dirk Brenken <dev@brenken.org>

applications/luci-app-travelmate/luasrc/model/cbi/travelmate/wifi_add.lua

@@ -199,7 +199,7 @@ function wssid.write(self, section, value)
 		elseif encr:formvalue(section) ~= "owe" then
 			uci:set("wireless", newsection, "key", wkey:formvalue(section) or "")
 		end
-		if ciph and ciph:formvalue(section) ~= "auto" then
+		if ciph and ciph:formvalue(section) and ciph:formvalue(section) ~= "auto" then
 			uci:set("wireless", newsection, "encryption", encr:formvalue(section) .. "+" .. ciph:formvalue(section))
 		else
 			uci:set("wireless", newsection, "encryption", encr:formvalue(section))

applications/luci-app-travelmate/luasrc/model/cbi/travelmate/wifi_edit.lua

@@ -182,7 +182,7 @@ function wssid.write(self, section, value)
 		elseif encr:formvalue(section) ~= "owe" then
 			uci:set("wireless", m.hidden.cfg, "key", wkey:formvalue(section) or "")
 		end
-		if ciph and ciph:formvalue(section) ~= "auto" then
+		if ciph and ciph:formvalue(section) and ciph:formvalue(section) ~= "auto" then
 			uci:set("wireless", m.hidden.cfg, "encryption", encr:formvalue(section) .. "+" .. ciph:formvalue(section))
 		else
 			uci:set("wireless", m.hidden.cfg, "encryption", encr:formvalue(section))