bug #9443 [FrameworkBundle] Fixed the registration of validation.xml …

…file when the form is disabled (hason)

This PR was submitted for the 2.1 branch but it was merged into the 2.2 branch instead (closes #9443).

Discussion
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[FrameworkBundle] Fixed the registration of validation.xml file when the form is disabled

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

cfa5aa5 [FrameworkBundle] Fixed the registration of validation.xml file when the form is disabled

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -624,9 +624,13 @@ private function registerValidationConfiguration(array $config, ContainerBuilder
 
     private function getValidatorXmlMappingFiles(ContainerBuilder $container)
     {
-        $reflClass = new \ReflectionClass('Symfony\Component\Form\FormInterface');
-        $files = array(dirname($reflClass->getFileName()).'/Resources/config/validation.xml');
-        $container->addResource(new FileResource($files[0]));
+        $files = array();
+
+        if (interface_exists('Symfony\Component\Form\FormInterface')) {
+            $reflClass = new \ReflectionClass('Symfony\Component\Form\FormInterface');
+            $files[] = dirname($reflClass->getFileName()).'/Resources/config/validation.xml';
+            $container->addResource(new FileResource($files[0]));
+        }
 
         foreach ($container->getParameter('kernel.bundles') as $bundle) {
             $reflection = new \ReflectionClass($bundle);