Comment 1 for bug 1287310

Raphaël, this error is triggered from Django's own clean() deep inside our DictCharField.clean_sub_fields(). Do you have any ideas on how we can get it to put the list of valid choices up there?

Failing that, we need to rely on the api feature I added to get the list of available power_types on a cluster
(nodes.describe_power_types).