Add genderEntity to normalizeNullValue of PersonDocGenNormalizer

src/Bundle/ChillPersonBundle/Serializer/Normalizer/PersonDocGenNormalizer.php

@@ -216,6 +216,7 @@ class PersonDocGenNormalizer implements
             'civility' => Civility::class,
             'birthdate' => \DateTimeInterface::class,
             'deathdate' => \DateTimeInterface::class,
+            'genderEntity' => Gender::class,
             'gender', 'maritalStatus',
             'maritalStatusDate' => \DateTimeInterface::class,
             'maritalStatusComment',

src/Bundle/ChillPersonBundle/Tests/Serializer/Normalizer/PersonDocGenNormalizerTest.php

@@ -40,7 +40,6 @@ final class PersonDocGenNormalizerTest extends KernelTestCase
 
     private const BLANK = [
         'id' => '',
-        'center' => '',
         'firstName' => '',
         'lastName' => '',
         'altNames' => '',