minor #978 Minor optimization in ValidatorServiceProvider (elazar)

This PR was merged into the 1.2 branch.

Discussion
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Minor optimization in ValidatorServiceProvider

`ReflectionClass` is only needed if a translator is present. Moving usage of it inside the related conditional means one less object instantiation.

Commits
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1aed8cdf Minor optimization in ValidatorServiceProvider

src/Silex/Provider/ValidatorServiceProvider.php

@@ -29,9 +29,8 @@ class ValidatorServiceProvider implements ServiceProviderInterface
     public function register(Application $app)
     {
         $app['validator'] = $app->share(function ($app) {
-            $r = new \ReflectionClass('Symfony\Component\Validator\Validator');
-
             if (isset($app['translator'])) {
+                $r = new \ReflectionClass('Symfony\Component\Validator\Validator');
                 $app['translator']->addResource('xliff', dirname($r->getFilename()).'/Resources/translations/validators.'.$app['locale'].'.xlf', $app['locale'], 'validators');
             }