Modal close button without title is left aligned

Created by: bembelimen

Hello,

if you create a modal without a title, the close button is not aligned right but left.

<div class="modal fade">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        <p>Modal body text goes here.</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-primary">Save changes</button>
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
      </div>
    </div>
  </div>
</div>

For testing, you could just remove the title from the modals on the example page via the browser inspector: http://v4-alpha.getbootstrap.com/components/modal/#examples