[PATCH] crypto: Avoid pretending to verify signatures on unsigned encrypted mail

[Daniel Kahn Gillmor]

On Sat 2019-04-20 13:02:57 -0400, Daniel Kahn Gillmor wrote:
> Unsigned encrypted mail shows up with a weird empty signature list.
> If we successfully decrypted and there was no signature in it, we
> should just not show a sigstatus at all.

Just a ping on this -- i don't think it should be particularly
controversial, and the tests all pass!

    --dkg