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

src/Bundle/ChillPersonBundle/PersonIdentifier/Identifier/StringIdentifier.php

@@ -38,4 +38,9 @@ final readonly class StringIdentifier implements PersonIdentifierEngineInterface
     {
         return $identifier?->getValue()['content'] ?? '';
     }
+
+    public function isEmpty(PersonIdentifier $identifier): bool
+    {
+        return '' !== trim($identifier->getValue()['content'] ?? '');
+    }
 }

src/Bundle/ChillPersonBundle/PersonIdentifier/PersonIdentifierEngineInterface.php

@@ -24,4 +24,12 @@ interface PersonIdentifierEngineInterface
     public function buildForm(FormBuilderInterface $builder, PersonIdentifierDefinition $personIdentifierDefinition): void;
 
     public function renderAsString(?PersonIdentifier $identifier, PersonIdentifierDefinition $definition): string;
+
+    /**
+     * Return true if the identifier must be considered as empty.
+     *
+     * This is in use when the identifier is validated and must be required. If the identifier is empty and is required
+     * by the definition, the validation will fails.
+     */
+    public function isEmpty(PersonIdentifier $identifier): bool;
 }

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);
+    }
 }