Fix url helper to work also in console applications. (#1416)

(cherry picked from commit 4c266e12)

module/VuFind/src/VuFind/View/Helper/Root/Url.php

@@ -52,7 +52,7 @@ class Url extends \Laminas\View\Helper\Url
      *
      * @param Request $request Request object for GET parameters
      */
-    public function __construct(Request $request)
+    public function __construct(Request $request = null)
     {
         $this->request = $request;
     }