Round 2: fix for notmuch show segfault

[Mark Walters]

This looks good and works (tested without patch 2/3). I don't have a
view on whether we should do the second patch or just update the docs.

Best wishes

Mark



On Thu, 23 Jan 2014, David Bremner <david at tethera.net> wrote:
> Second try. The second patch is now not really needed (although I
> didn't test without it). If omitted, the library docs should probably
> be updated.
>
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