style no-results message (bug 672658)

apps/addons/templates/addons/impala/listing/items.html

@@ -53,5 +53,7 @@
         {{ install_button(addon, impala=True, collection=collection) }}
       </div>
     </div>
+  {% else %}
+    {% include 'search/no_results.html' %}
   {% endfor %}
 {% endcache %}

media/css/impala/listing.less

@@ -47,6 +47,14 @@ header .feed {
     }
 }
 
+.no-results {
+    text-align: center;
+    padding: 20px;
+    box-shadow: 0 1px #fff;
+    opacity: .5;
+    font: bold 24px @sans-stack;
+}
+
 .listing .item {
     border-top: 1px dotted @border-blue;
     color: @note-gray;