[PATCH] CLI/restore: handle missing keys and values in config data.

[Daniel Kahn Gillmor]

On Sun 2018-01-07 17:30:25 -0400, David Bremner wrote:
> Although such lines can't occur in notmuch dump output, they might be
> useful for clearing config, and anyway segfaulting is not the best
> error message.

I don't think we want "notmuch restore" to actually clear any
configurations (it's always been additive thus far and changing that
seems dicey to me), but the patch itself here looks good to me.

thanks for fixing the segfault, bremner.

       --dkg
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