another unhelpful error message

[blampe]

tchannel in build
Unconsumed error None

elif message.message_type == Types.ERROR:
    context = self.message_buffer.pop(message.id, None)
    if context is None:
        log.warn('Unconsumed error %s', context)
        return None
    else:
        error = TChannelError.from_code(
            message.code,
            description=message.description,
            tracing=context.tracing,
        )

        context.set_exception(error)
        return error```