segmentation fault caused by empty application/pgp-signature part

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+From: David Bremner <david@tethera.net>\r
+To: notmuch mailing list <notmuch@notmuchmail.org>\r
+Subject: segmentation fault caused by empty application/pgp-signature part\r
+User-Agent: Notmuch/0.15.2+217~gb60fb33 (http://notmuchmail.org) Emacs/24.3.1\r
+       (x86_64-pc-linux-gnu)\r
+Date: Fri, 19 Jul 2013 09:10:57 -0300\r
+Message-ID: <87mwpiu4vi.fsf@zancas.localnet>\r
+MIME-Version: 1.0\r
+Content-Type: multipart/mixed; boundary="==-=-="\r
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+X-List-Received-Date: Fri, 19 Jul 2013 12:11:11 -0000\r
+\r
+--==-=-=\r
+Content-Type: text/plain\r
+\r
+\r
+The attached message is edited from one I managed to convince notmuch-emacs to\r
+send via some mishap with gpg-agent. It has an empty signature\r
+part. Clearly this is wrong, but on the other hand, it should not cause\r
+notmuch show --decrypt to segmentation fault. As for the actual creation\r
+of the message, I suppose that's more likely a bug in emacs, if\r
+anything.\r
+\r
+\r
+--==-=-=\r
+Content-Type: message/rfc822\r
+Content-Disposition: attachment; filename=pgp-fail.eml\r
+\r
+Delivery-date: Fri, 05 Jul 2013 15:11:10 -0300\r
+From: David Bremner <bremner@debian.org>\r
+To: blah blah <blah@blah.com>\r
+Subject: blah\r
+Date: Fri, 05 Jul 2013 15:10:32 -0300\r
+Message-ID: <empty-pgp-sig>\r
+MIME-Version: 1.0\r
+Content-Type: multipart/signed; boundary="=-=-=";\r
+X-Spam-Score: -0.0\r
+X-Spam_bar: /\r
+\r
+protocol="application/pgp-signature"\r
+\r
+--=-=-=\r
+Content-Type: text/plain\r
+Content-Transfer-Encoding: quoted-printable\r
+\r
+blah\r
+\r
+--=-=-=\r
+Content-Type: application/pgp-signature\r
+\r
+\r
+--=-=-=--\r
+\r
+--==-=-=--\r