Warning in AdminController.php

If debugging is on (_PS_MODE_DEV_ set to TRUE)

On a fresh install there is a warning on admin home page (/admin/index.php?controller=AdminHome) 
on line 1542 in /classes/controller/AdminController.php at function addToolBarModulesListButton().

Because of the warning xml files are not populated with data.

Warning: simplexml_load_file()
1: parser error : Document is empty