'Returns a (possibly empty) list of clients for which Account is a developer.'

@classmethod
def _by_developer(cls, account):

    if account._deleted:
        return []
    try:
        cba = OAuth2ClientsByDeveloper._byID(account._id36)
    except tdb_cassandra.NotFound:
        return []
    clients = cls._byID(cba._values().keys())
    return [client for client in clients.itervalues() if ((not client.deleted) and client.has_developer(account))]
