Update FormTypeParser.php

This catch is missing, because it can break here https://github.com/symfony/Form/blob/master/FormRegistry.php#L89

Parser/FormTypeParser.php

@@ -12,6 +12,7 @@
 namespace Nelmio\ApiDocBundle\Parser;
 
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Form\Exception\InvalidArgumentException;
 use Symfony\Component\OptionsResolver\Exception\MissingOptionsException;
 use Symfony\Component\Form\FormFactoryInterface;
 use Symfony\Component\Form\Exception\FormException;
@@ -172,6 +173,8 @@ class FormTypeParser implements ParserInterface
             return $this->formFactory->create($item);
         } catch (UnexpectedTypeException $e) {
             // nothing
+        } catch (InvalidArgumentException $e) {
+            // nothing
         }
     }
 }