[fix] hide number of results if 0

searx/templates/oscar/results.html

@@ -78,7 +78,7 @@
         </div><!-- /#main_results -->
 
         <div class="col-sm-4" id="sidebar_results">
-            {% if number_of_results %}
+            {% if number_of_results != '0' %}
             <div class="panel panel-default">
                 <div class="panel-heading">
                     <h4 class="panel-title">{{ _('Number of results') }}</h4>