[REF] Fix Authx tests on Druapl 8/9 by ensuring that we only return an id for...

[REF] Fix Authx tests on Druapl 8/9 by ensuring that we only return an id for the user id if it is greater than 0

ext/authx/Civi/Authx/Drupal8.php

@@ -54,7 +54,7 @@ class Drupal8 implements AuthxInterface {
    */
   public function getCurrentUserId() {
     $user = \Drupal::currentUser();
-    return $user ? $user->getAccount()->id() : NULL;
+    return $user && $user->getAccount()->id() ? $user->getAccount()->id() : NULL;
   }
 
 }