管理员管理优化

@@ -58,7 +58,7 @@ class Admin extends Backend
 
         $store = new \app\admin\model\Store;
         $store =  $store->where([])->select();
-        $storedata = [];
+        $storedata[''] = '无';
         foreach ($store as $v){
             $storedata[$v['id']] = $v['name'];
         }