Issue #2707689: NodeForm::actions() checks for delete access on new entities

core/lib/Drupal/Core/Url.php

@@ -564,7 +564,7 @@ public function isRouted() {
    */
   public function getRouteName() {
     if ($this->unrouted) {
-      throw new \UnexpectedValueException('External URLs do not have an internal route name.');
+      throw new \UnexpectedValueException($this->getUri() . ' has no corresponding route.');
     }
 
     return $this->routeName;