Switch to side-by-side view

--- a/Allura/allura/templates/repo/diff.html
+++ b/Allura/allura/templates/repo/diff.html
@@ -20,7 +20,7 @@
   {% endif %}
   {% if a.has_html_view and b.has_html_view %}
   <div class="clip">
-    <h3><span class="ico-l"><b class="ui-icon ui-icon-document"></b> {{h.really_unicode(a.filename)}}</span></h3>
+    <h3><span class="ico-l"><b class="ui-icon ui-icon-document"></b> {{h.really_unicode(a.filename) or '&nbsp;'}}</span></h3>
     {{g.highlight(diff, lexer='diff')}}
   </div>
   {% endif %}
@@ -35,3 +35,9 @@
   </div>
   {% endif %}
 {% endblock %}
+
+{% block extra_css %}
+  <style type="text/css">
+    .clip h3 {margin-bottom: 0;
+  </style>
+{% endblock %}