RequestLimitExceeded errors from EC2 produce exceptions which don't str() or repr()

[Steven Hazel]

Here's the original XML response from EC2:

<?xml version="1.0"?>
<Response><Errors><Error><Code>RequestLimitExceeded</Code><Message>Request limit exceeded.</Message></Error></Errors><RequestID>xxx-xxx-xxx</RequestID></Response>

When that is returned, the resulting txaws.ec2.exception.EC2Error raises KeyError exceptions on both __str__ (where 'Message' is the missing key) and __repr__ (where it's 'Code').