fix một số bug nhỏ

controllers/AreaController.php

@@ -21,7 +21,7 @@ class AreaController extends Controller {
         parent::init();
         if (time() > Yii::$app->params["time"])
             $this->redirect(["/dashboard"]);
-        
+
         if (Yii::$app->user->isGuest)
             return $this->redirect(['/site/login']);
     }
@@ -89,7 +89,8 @@ class AreaController extends Controller {
             $oldCode = $model->code;
             $model->name = $data["Name"];
             $model->code = $data["Code"];
-            $model->pid = $data["Pid"];
+            if ($model->pid != 0)
+                $model->pid = $data["Pid"];
             $model->description = $data["Description"];
             $model->modified_at = time();
             if ($model->save()) {