检验参数是否存在

app/controller/api/store/product/StoreProduct.php

@@ -165,7 +165,7 @@ class StoreProduct extends BaseController
         [$page, $limit] = $this->getPage();
         if($this->source=='yhc' && $this->merId){
             $merId=$this->merId;
-        } elseif($params['mer_id']){
+        } elseif(isset($params['mer_id']) && $params['mer_id']){
             $merId=$params['mer_id'];
         } else{
             $merId=321;