[BUG] Decryption fails if message was signed with an unknown key

diff --git a/40/ccee116bd29799971415a3b53e09ee0b2678cb b/40/ccee116bd29799971415a3b53e09ee0b2678cb
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+From: Simon Hirscher <public@simonhirscher.de>\r
+Date: Thu, 5 Sep 2013 00:01:58 +0200\r
+Message-ID:\r
+ <CAEj42wtt9O1-k9hm9DNCh7En=b-eDYQWham5-FR-wzrt+sij+g@mail.gmail.com>\r
+Subject: [BUG] Decryption fails if message was signed with an unknown key\r
+To: notmuch@notmuchmail.org\r
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+\r
+Dear notmuch developers,\r
+\r
+This is now the second time the following has happened to me:\r
+\r
+#########\r
+$ notmuch show --decrypt id:xyz@example.com\r
+\r
+message{ id:xyz@example.com depth:0 match:1 excluded:0 filename:/home/simon=\r
+/***\r
+\r
+header{\r
+John Doe <sender@example.com> (Today 21:52) (encrypted inbox new)\r
+Subject: foobar\r
+From: John Doe <sender@example.com>\r
+To: ***\r
+Date: Thu, 01 Jan 1970 00:00:00 +0000\r
+\r
+header}\r
+\r
+body{\r
+Failed to decrypt part: gpg: ASCII-H=C3=BClle: Version: GnuPG v2.0.17 (Ming=\r
+W32)\r
+gpg: <list of keys the message was encrypted with>\r
+gpg: AES256 encrypted data\r
+gpg: Original file name=3D''\r
+gpg: Signature from Thu 01 Jan 1970 00:00:00 UTC by DSA key ID <sender's ke=\r
+y>\r
+gpg: Signature cannot be verified. Public key not found\r
+\r
+part{ ID: 1, Content-type: multipart/encrypted\r
+\r
+part{ ID: 2, Content-type: application/pgp-encrypted\r
+Non-text part: application/pgp-encrypted\r
+\r
+part}\r
+\r
+part{ ID: 3, Filename: encrypted.asc, Content-type: application/octet-strea=\r
+m\r
+Non-text part: application/octet-stream\r
+\r
+part}\r
+\r
+part}\r
+\r
+body}\r
+\r
+message}\r
+\r
+$ gpg --recv-keys <sender's key>\r
+\r
+$ notmuch show --decrypt id:xyz@example.com\r
+\r
+[=E2=80=A6]\r
+Hey there,\r
+Now the decryption worked!\r
+[=E2=80=A6]\r
+\r
+############\r
+\r
+Also, I should add that manually decrypting the message with gpg (i.e.\r
+without using notmuch) already worked *before* I added the sender's\r
+key (not shown above). Still, notmuch obviously doesn't like it when\r
+the sender is unknown.\r
+\r
+I hope you're going to look into this. Thank you!\r