error-codes missing in failure response

I have a verification request that's returning the following response: { "success": false } Notice that the "error-codes" element is not present. Although the docs at http://bit.ly/1v2hUig state that the error-codes element is "optional", am I correct in interpreting the docs to mean that error-codes should always be present if success=false? So is this a bug or do I need to be prepared to handle failures that don't have any error codes? It would seem silly to return a failure without any explanation. -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.