Fix format selection help trigger.

lib/gollum/frontend/public/javascript/gollum.js

@@ -165,7 +165,9 @@ $(function(){
 
   $('#wiki_format').change(function() {
     var target = $('#editbar .sections .toc div.current').get(0)
-    sectionItemClick.call(target)
+    if (target != undefined) {
+      sectionItemClick.call(target)
+    }
   })
 
   var sectionItemClick = function() {

lib/gollum/frontend/templates/editbar.mustache

@@ -30,7 +30,7 @@
   </div>
   <div class="sections">
     <div class="toc">
-      <div class="headers current">Headers</div>
+      <div class="headers">Headers</div>
       <div class="links gollum">Links</div>
       <div class="images gollum">Images</div>
       <div class="code gollum">Code</div>