志愿者修改

@@ -26,14 +26,14 @@ class ClockModel extends Model
 
     public function getUserStartTextAttr($value,$data){
         if (empty($data['user_start'])){
-            return;
+            return '';
         }
         return date('H:i',$data['user_start']);
     }
 
     public function getUserEndTextAttr($value,$data){
         if (empty($data['user_end'])){
-            return;
+            return '';
         }
         return date('H:i',$data['user_end']);
     }