Double border on .list-group-item when followed by .card-footer

Created by: royklutman

When using a .list-group .list-group-flush in a card followed by .card-footer, the list last list group item does have a border, so basically this is not being applied: https://github.com/twbs/bootstrap/blob/da717b03e6e72d7a61c007acb9223b9626ae5ee5/scss/_list-group.scss#L100-L104

It is however correctly applied when followed by a .card-body, as supposed:

CodePen to reproduce: https://codepen.io/anon/pen/PdPxgG?editors=1000