segmentation fault caused by empty application/pgp-signature part

[David Bremner]

The attached message is edited from one I managed to convince notmuch-emacs to
send via some mishap with gpg-agent. It has an empty signature
part. Clearly this is wrong, but on the other hand, it should not cause
notmuch show --decrypt to segmentation fault. As for the actual creation
of the message, I suppose that's more likely a bug in emacs, if
anything.

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