优化产品配置问题

Application/Admin/Controller/QcodeController.class.php

@@ -361,11 +361,12 @@ class QcodeController extends AddonController{
             $user = M('admin_user');
             $user_data = $user->where('id='.$uid)->field('product_id')->find();
             $user_product = $user_data['product_id'];
+
             $id = I('post.id');
             $ids = explode(',',$id);
             if(I('post.status')=="1"){//增加产品
                 $new_product = array();
-                if (!isset($user_product)){//第一次增加
+                if ($user_product == ''){//第一次增加
                     $data['product_id'] = $id;
                 }else{
                     $user_product = explode(',',$user_product);