Empty dd tags in horizontal definition list are causing wrong order

Created by: kapexx

In horizontal definition lists, empty dd tags seem to have no size and are causing issues. Any dd tags following an empty one, move up so that they are displayed next to a wrong dt tag, i.e they stack on the right side, ignoring the positions of the terms.

It can be fixed by adding a clearfix:

.dl-horizontal { 
    dd { .clearfix(); }
}