removes extra line for empty milestone description

app/assets/stylesheets/framework/common.scss

@@ -373,4 +373,4 @@ table {
   border-top: 1px solid $border-color;
 }
 
-.hide-bottom-border { border-bottom: none;}
+.hide-bottom-border { border-bottom: none !important; }

app/views/projects/milestones/show.html.haml

@@ -31,7 +31,7 @@
         = link_to namespace_project_milestone_path(@project.namespace, @project, @milestone), data: { confirm: 'Are you sure?' }, method: :delete, class: "btn btn-grouped btn-danger" do
           Delete
 
-  .detail-page-description.milestone-detail
+  .detail-page-description.milestone-detail{ class: ('hide-bottom-border' unless @milestone.description.present? ) }
     %h2.title
       = markdown_field(@milestone, :title)
     %div