fixed a notice in add users to admin platform

main/admin/dashboard_add_users_to_user.php

@@ -327,6 +327,8 @@ echo Display::page_header(
         null, $size = 'h3'
 );
 
+$assigned_users_to_hrm = array();
+
 switch ($userStatus) {
     case DRH:
         $assigned_users_to_hrm = UserManager::get_users_followed_by_drh($user_id);