[edgy] Can't read signed + encrypted mail when sig-key not available

Binary package hint: evolution

I just got a mail that was encrypted (for me) and signed (from the other
person). Because I did not yet have his key, Evolution showed a red error
message about not being able to find the public key, together with the
encrypted mail.

Saving the mail and decrypting on the command line ("gpg -d mail") was
possible, though GPG also complained about not being able to verify the
signature.

Evolution should at least decrypt the message, showing only errors about the
signature verification.

Steps to reproduce:
1. Open Evolution
2. Receive GPG-encrypted & -signed mail
3. Open the mail
4. Enter GPG password

Actual results:
I see a red error message about the public key for the signature not being
found + the encrypted mail text.

Expected results:
I'd like to see the decrypted mail text + a signature verification warning.

Does this happen every time?
Yes.