PHP 8.0 undefined variable 오류 수정

uri.lib.php 에서 uri.class.php 사용하지않고 있음.

lib/shop.uri.lib.php

@@ -138,7 +138,7 @@ function shop_short_url_clean($string_url, $url, $page_name, $array_page_names){
             $add_param = '?'.http_build_query($result,'','&');
         }
 
-        if( $add_qry ){
+        if( isset($add_qry) ){
             $add_param .= $add_param ? '&'.$add_qry : '?'.$add_qry;
         }