PayU Latam: Fix bug in confirmation page

I watched the issue http://forge.prestashop.com/browse/PNM-2903 and searching about it but I not found a solution. I found this article http://addons-modules.com/store/en/content/31--why-the-cart-is-not-cleared-after-payment- and I could check the behavior therefore I would say it's not a bug but I'm not sure.