Postcode validator won't work when the postcode is unknown to it. (eg. Suriname does not have postcodes) and is not listed in the validator internal regularExpression array. So I would like to disable the requirement on it when such an exception is thrown... Is that possible?

gistfile1.txt

'postcode' => array(
                'filters' => array(
                    array('name' => 'StringTrim'),
                    array('name' => 'StripTags')
                ),
                'validators' => array(
                    array(
                        'name' => 'Callback',
                        'options' => array(
                            'callback' => function ($value, $context = null) use ($postcodeValidator) {
                                if (!isset($context['country']) || empty($context['country'])) {
                                    return true; // return true if no validation is necessary
                                }
                                $postcodeValidator->setLocale('xx_' . strtoupper($context['country']));

                                // throws InvalidArgumentException("A postcode-format string has to be given for validation")
                                // I can catch and return true, but that leaves the fiels open for any input but nothing
                                $result = $postcodeValidator->isValid($value);

                                return $result;
                            },
                            'messages' => array(
                                'callbackValue' => translate('Does not appear to be a valid postal code for this country'),
                            )
                        ),
                    ),
                ),
            ),