Use -n instead of ! -z to check for AID

steamtinkerlaunch

@@ -19782,7 +19782,7 @@ function updateMO2PortConf {
 
 	if [ -z "${MONGURL}" ]; then
 		# Fall back to AID if MO2GAM couldn't be found
-		if [ ! -z "$AID" ]; then
+		if [ -n "$AID" ]; then
 			MONGURL="$(grep -i "\"$AID\"" "$MO2GAMES" | head -n1 | cut -d ';' -f4)"
 			MONGURL="${MONGURL//\"}"
 			if [ -z "${MONGURL}" ]; then