Confirm product instance does not return "ownerId" element

GET /services/Eucalyptus/?AWSAccessKeyId=XXX&Action=ConfirmProductInstance&InstanceId=i-xxxx&ProductCode=ABCD&SignatureMethod=HmacSHA256&SignatureVersion=2&Timestamp=2010-03-21T16%3A48%3A39&Version=2009-11-30&Signature=YYY HTTP/1.1.

<ConfirmProductInstanceResponse xmlns="http://ec2.amazonaws.com/doc/2009-11-30/"><requestId>83ccc60e-420e-4771-9ed5-78d4e45069af</requestId><return>false</return></ConfirmProductInstanceResponse>

API reference:

http://docs.amazonwebservices.com/AWSEC2/2009-08-15/APIReference/ApiReference-query-ConfirmProductInstance.html

The result is that the user facing error is:

$ euca-confirm-product-instance -i i-xxxx ABCD
'ResultSet' object has no attribute 'ownerId'

In addition, if the instance does not exist, the above response is returned anyway, instead of returning an error message in the following format (as with other calls),

<?xml version="1.0"?><Response><Errors><Error><Code>Code goes here</Code><Message>Instance does not exist: i-xxxx</Message></Error></Errors><RequestID>7b57abbf-4270-45da-a430-7d21347a5ea7</RequestID></Response>