[sheepdog] Avoid empty cluster snapshot

[Hitoshi Mitake]

On Thu, Apr 24, 2014 at 9:50 PM, Valerio Pachera <sirio81 at gmail.com> wrote:
> If there are no active snapshots in the cluster I think 'dog cluster
> snapshot save' has to print an error.
>
> If you think the same, I'm going to file a bug request.

I agree, making snapshot of clusters which don't have snapshots
doesn't make sense.

Thanks,
Hitoshi

>
> Thank you.
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