Only set the cart user if the user is logged in.
Only set the cart user if the user is logged in.

leosmeira/spree_pag_seguro,saurabhbhatia/spree-pp-website-standard,agencyleroy/spree_paytrail,agencyleroy/spree_paytrail,tomash/spree-pp-website-standard,tomash/spree-pp-website-standard,heavenstudio/spree_pag_seguro,eoy/spree_paytrail,saurabhbhatia/spree-pp-website-standard,heavenstudio/spree_pag_seguro