Check $filters is an array

[trsteel88]

Every now and again I get the following error:

[2015-04-24 14:19:57] request.CRITICAL: Uncaught PHP Exception Symfony\Component\Debug\Exception\ContextErrorException: "Catchable Fatal Error: Argument 3 passed to Liip\ImagineBundle\Imagine\Cache\Signer::check() must be of the type array, string given, called in application/releases/20150424033514/vendor/liip/imagine-bundle/Liip/ImagineBundle/Controller/ImagineController.php on line 130 and defined" at application/releases/20150424033514/vendor/liip/imagine-bundle/Liip/ImagineBundle/Imagine/Cache/Signer.php line 37 {"exception":"[object] (Symfony\\Component\\Debug\\Exception\\ContextErrorException(code: 0): Catchable Fatal Error: Argument 3 passed to Liip\\ImagineBundle\\Imagine\\Cache\\Signer::check() must be of the type array, string given, called in application/releases/20150424033514/vendor/liip/imagine-bundle/Liip/ImagineBundle/Controller/ImagineController.php on line 130 and defined at application/releases/20150424033514/vendor/liip/imagine-bundle/Liip/ImagineBundle/Imagine/Cache/Signer.php:37)"} []

I believe this is because someone is modifying the query parameters for runtime config requests. This patch resolves this issue.

[lsmith77]

looks sensible to me

[makasim]

Good catch! Thanks.