商户申请

@@ -110,6 +110,8 @@ class Merchant extends WechatBase
         }
         if(!empty($param['other_images'])){
             $param['other_images'] = implode(',',$param['other_images']);
+        }else{
+            $param['other_images'] = null;
         }
         $param['business_images'] = implode(',',$param['business_images']);
         $data = Db::name('merchant_audit')->where(['user_id'=>$this->user_id])->find();