hide menu when zero filtered items, this prevents erroneous errors wh…

…en enter or tab is hit after typing the trigger then typing to empty the list. (#3)

js/tribute.js

@@ -178,6 +178,11 @@ if (!Array.prototype.find) {
 
       this.current.filteredItems = items
 
+      if(!items.length) {
+        this.hideMenu();
+        return;
+      }
+
       let ul = this.menu.querySelector('ul')
 
       ul.innerHTML = ''