removes extra line for empty issue description

app/assets/stylesheets/framework/common.scss

@@ -372,3 +372,5 @@ table {
   margin-right: -$gl-padding;
   border-top: 1px solid $border-color;
 }
+
+.hide-bottom-border { border-bottom: none;}

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

@@ -53,7 +53,7 @@
 
 
 .issue-details.issuable-details
-  .detail-page-description.content-block
+  .detail-page-description.content-block{class: ('hide-bottom-border' unless @issue.description.present? )}
     %h2.title
       = markdown_field(@issue, :title)
     - if @issue.description.present?