title: Form does not display form errors in template
body: <p>For my contact form no form errors are displayed.</p>
  
  <pre><code>    $contact = new Contact();
  
      $form = $this-&gt;createForm(new ContactFormType(), $contact);
  
      /* handle contact form submission */
      if ('POST' == $request-&gt;getMethod()) {
          $form-&gt;bindRequest($request);
  
          if ($form-&gt;isValid()) {
              //Do something
          }
      }
  
      return $this-&gt;render('MainBundle:Default:contact.html.twig', array(
                  'form' =&gt; $form-&gt;createView()
      ));
  </code></pre>
  
  <p>My validator</p>
  
  <pre><code>Fc\MainBundle\Entity\Contact:
      properties:
          firstName:
              - NotBlank: ~
  
          lastName:
              - NotBlank: ~
  
          email:
              - NotBlank: ~
              - Email:
                  checkMX: true
          title:
              - NotBlank: ~
          message:
              - NotBlank: ~
  </code></pre>
  
  <p>I have added a novalidate attribute to my form tag to check if my validation works. Now when I submit the form with empty data nothing happens (with correct data everything is fine), the controller identifies the form as invalid and stops further processes.</p>
  
  <p>In the template I call </p>
  
  <pre><code> {{ form_errors(form) }}
  </code></pre>
  
  <p>But nothing is displayed. Any ideas why? I use symfony 2.1.X</p>