[Form] Force hidden fields to not have "required" attribute (#1091)

src/Symfony/Component/Form/Extension/Core/Type/HiddenType.php

@@ -18,6 +18,9 @@ class HiddenType extends AbstractType
     public function getDefaultOptions(array $options)
     {
         return array(
+            // Force hidden fields to be not required
+            // More info: https://github.com/symfony/symfony/issues/1091
+            'required'       => false,
             // Pass errors to the parent
             'error_bubbling' => true,
         );