Added a "No results found"

app/assets/javascripts/liveSearch.js

@@ -15,6 +15,7 @@
 
     let query = normalize($searchBox.val());
     let results = 0;
+    let $noResultsMessage = $('.js-live-search-no-results');
 
     $targets.each(function() {
 
@@ -39,6 +40,12 @@
 
     });
 
+    if (query !== '' && results === 0) {
+      $noResultsMessage.show();
+    } else {
+      $noResultsMessage.hide();
+    }
+
     if (state === 'loaded') {
       if (query !== '') {
         $searchBox.attr('aria-label', $searchLabel.text().trim() + ', ' + resultsSummary(results));