[Validation][FrameworkBundle] Allow EnableAutoMapping to work without auto-mapping namespaces

Author: ogizanagi

DependencyInjection/Configuration.php

@@ -861,7 +861,7 @@ private function addValidationSection(ArrayNodeDefinition $rootNode)
                             ->end()
                         ->end()
                         ->arrayNode('auto_mapping')
-                            ->info('A collection of namespaces for which auto-mapping will be enabled.')
+                            ->info('A collection of namespaces for which auto-mapping will be enabled by default, or null to opt-in with the EnableAutoMapping constraint.')
                             ->example([
                                 'App\\Entity\\' => [],
                                 'App\\WithSpecificLoaders\\' => ['validator.property_info_loader'],

DependencyInjection/FrameworkExtension.php

@@ -1312,7 +1312,7 @@ private function registerValidationConfiguration(array $config, ContainerBuilder
         }
 
         $container->setParameter('validator.auto_mapping', $config['auto_mapping']);
-        if (!$propertyInfoEnabled || !$config['auto_mapping'] || !class_exists(PropertyInfoLoader::class)) {
+        if (!$propertyInfoEnabled || !class_exists(PropertyInfoLoader::class)) {
             $container->removeDefinition('validator.property_info_loader');
         }