Add missing use statement

Form/DataTransformer/ModelsToArrayTransformer.php

@@ -11,6 +11,7 @@
 
 namespace Sonata\AdminBundle\Form\DataTransformer;
 
+use Doctrine\Common\Util\ClassUtils;
 use Sonata\AdminBundle\Form\ChoiceList\ModelChoiceList;
 use Sonata\AdminBundle\Form\ChoiceList\ModelChoiceLoader;
 use Sonata\AdminBundle\Model\ModelManagerInterface;