BUGFIX: parent::init() should be called before customised code in SubscriptionPage
BUGFIX: parent::init() should be called before customised code in SubscriptionPage

silverstripe-archive/silverstripe-newsletter,silverstripe-labs/silverstripe-newsletter,guru-digital/silverstripe-newsletter,silverstripe-labs/silverstripe-newsletter,guru-digital/silverstripe-newsletter,silverstripe-archive/silverstripe-newsletter,guru-digital/silverstripe-newsletter,silverstripe-labs/silverstripe-newsletter