I can remove it to keep things clean, but I can't add the test yet because that functionality isn't actually there (non zero RCs when errors happen).  Once I get https://github.com/aws/aws-cli/issues/340 and all the related issues fixed I need to go back and add tests for non zero RCs in the failure case.

From what I can tell this is going to take some amount of work so it's out of the scope for this PR.