code review by hf: fixes bug to coupon newuser second times

@@ -27,6 +27,7 @@ class DetailData
      * 
      * @param int $productId 商品ID
      * @param int $uid 用户ID
+     * @param int $productSkn SKN
      * @return array
      */
     public static function baseInfo($productId, $uid, $productSkn = null)

@@ -39,7 +39,7 @@ class DetailModel
         elseif (is_numeric($productSkn)) {
             $baseInfo = DetailData::baseInfo(null, $uid, $productSkn);
         }
-        
+
         // 商品名称
         if (empty($baseInfo['productName'])) {
             return $result;