Remove empty PersonIdentifier values during denormalization and add isEmpty logic to PersonIdentifierWorker. Include tests for empty value handling.

src/Bundle/ChillPersonBundle/PersonIdentifier/PersonIdentifierWorker.php

@@ -46,4 +46,12 @@ final readonly class PersonIdentifierWorker
     {
         return $this->identifierEngine->renderAsString($identifier, $this->definition);
     }
+
+    /**
+     * Return true if the identifier must be considered as empty.
+     */
+    public function isEmpty(PersonIdentifier $identifier): bool
+    {
+        return $this->identifierEngine->isEmpty($identifier);
+    }
 }