BUGFIX: Use nodeAggregateId as fallback for uriPathSegment instead of ""

Since "" is treated as the uriPath for a site node this causes confusion if it is projected for a document in cases where one was created without an uriPathSegment which may happen for tethered nodes.

Resolves: #5412

Neos.Neos/Classes/FrontendRouting/Projection/DocumentUriPathProjection.php

@@ -209,7 +209,7 @@ private function whenNodeAggregateWithNodeWasCreated(NodeAggregateWithNodeWasCre
         }
 
         $propertyValues = $event->initialPropertyValues->getPlainValues();
-        $uriPathSegment = $propertyValues['uriPathSegment'] ?? '';
+        $uriPathSegment = $propertyValues['uriPathSegment'] ?? $event->nodeAggregateId->value;
 
         $shortcutTarget = null;
         if ($documentTypeClassification === DocumentTypeClassification::CLASSIFICATION_SHORTCUT) {