fix(event-drowdown): only display events dropdown if events exists (#362)

Author: M3lkior

site/app/views/default/index.html

@@ -151,7 +151,7 @@ <h3>{{view.title}}</h3>
           </paper-tabs>
         </div>
 
-        {% if view.id == 'default' %}
+        {% if view.id == 'default' && views|length > 1 %}
         <paper-dropdown-menu
           label="Choose an event"
           class="dropdown-filter"