Switch to side-by-side view

--- a/Allura/allura/templates/repo/commit.html
+++ b/Allura/allura/templates/repo/commit.html
@@ -85,9 +85,7 @@
             <h6>
             {% if type in ('added', 'changed') %}
                 <a href="{{commit.url()}}tree/{{h.really_unicode(file)}}">{{h.really_unicode(file)}}</a>
-                {% if prev %}
-                    <a class="commit-diff-link" href="{{commit.url()}}tree/{{h.really_unicode(file)}}?diff={{prev[0]._id}}">Diff</a>
-                {% endif %}
+                <a class="commit-diff-link" href="{{commit.url()}}tree/{{h.really_unicode(file)}}?diff={{prev[0]._id if prev else ''}}">Diff</a>
             {% elif type == 'removed' %}
                 <a href="{{prev[0].url()}}tree/{{h.really_unicode(file)}}">{{h.really_unicode(file)}}</a>
             {% elif type == 'copied' %}
@@ -106,17 +104,15 @@
                     {{g.highlight(file.diff, lexer='diff')}}
                   {% endif %}
                 {% else %}
-                    {% if prev %}
                     <img src="{{g.forge_static('images/spinner.gif')}}" class="loading_icon" alt="Loading..."/>
                     <script type="text/javascript">
                         $(document).ready(function() {
                           diff_queue.push({
                             selector: '#diff-{{loop.index}}',
-                            url: '{{commit.url()}}tree/{{h.really_unicode(file)}}?barediff={{prev[0]._id}}'
+                            url: '{{commit.url()}}tree/{{h.really_unicode(file)}}?barediff={{prev[0]._id if prev else ''}}'
                           });
                         });
                     </script>
-                    {% endif %}
                 {% endif %}
             </div>
         </div>