[PATCH] emacs: fix a bug introduced by the recent search cleanups.

[David Bremner]

Mark Walters <markwalters1009 at gmail.com> writes:

> In commit 5d0883e the function notmuch-search-next-thread was changed.
> In particular it only goes to the next message if there is a next
> message. This breaks notmuch-show-archive-thread-then-next. Fix this
> by going to the "next" message whenever we are on a current message.

Pushed, 

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