Bug#913004: python-gnupg: should not fail on fingerprint collisions

I almost forgot, that there was a Debian bug report by Dominik, too: https://bugs.debian.org/850751

Bug#913004: python-gnupg: should not fail on fingerprint collisions

Package: python-gnupg Version: 0.4.3-1 GnuPG can live happily with fingerprint collisions, but python-gnupg cannot. Here a user of Gajim had a problem because of the check: https://paste.debian.net/1050481/ Upstream has already fixed this in master. IMHO it's worth to put the commit as a patch i