Fixed problem when element in main menu is not there (specs)

app/assets/javascripts/frequent_items/components/app.vue

@@ -49,7 +49,8 @@ export default {
     eventHub.$on(`${this.namespace}-dropdownOpen`, this.dropdownOpenHandler);
 
     // As we init it through requestIdleCallback it could be that the dropdown is already open
-    if (document.getElementById(`nav-${this.namespace}-dropdown`).classList.contains('show')) {
+    const namespaceDropdown = document.getElementById(`nav-${this.namespace}-dropdown`);
+    if (namespaceDropdown && namespaceDropdown.classList.contains('show')) {
       this.dropdownOpenHandler();
     }
   },