Filters throw uncaught exceptions and return improper response code

[weierophinney]

When validating the supplied data it's possible for a Filter that is attached to the InputFilter to throw an Exception. If this happens, Apigility will return a status code of 200 and depending on your settings it may show the Exception message or stack trace.

I propose wrapping the

$inputFilter->isValid()

call on https://github.com/zfcampus/zf-content-validation/blob/master/src/ContentValidationListener.php#L216 in a try/catch block, and returning a ApiProblemResponse with a status code of 422 should an Exception be thrown.

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Originally posted by @ashireman at zfcampus/zf-content-validation#32