OSAPI poor error handling on server resize down

In OSAPI v1.0, an attempt to resize down returns the following error entity. It should probably be a 400:

{"cloudServersFault": {"message": "Invalid flavor: cannot downsizeinstances", "code": 500}}

In OSAPI v1.1, a different error entity is returned. It's status code is correct, but it needs to explain to the user what went wrong (like "cannot downsize instances" in v1.0):

{"badRequest": {"message": "The server could not comply with the request since it is either malformed or otherwise incorrect.", "code": 400}}