[Form] Fixes php fatal error in CsrfValidationListener when form is bound with a string #7136
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Original PR : #7126
This PR includes a php unit test to reproduce the php fatal error.
$ phpunit src/Symfony/Component/Form/Tests/Extension/Csrf
PHPUnit 3.7.14 by Sebastian Bergmann.
..............PHP Fatal error: Cannot unset string offsets in src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php on line 70