cli: sign and verify emsa default is empty for Ed25519 (fix #1828)
cli: sign and verify emsa default is empty for Ed25519 (fix #1828)

Signed-off-by: Nuno Goncalves <54df356d35a1227da7b6a150655996586549b9d2@gmail.com>

webmaster128/botan,webmaster128/botan,randombit/botan,randombit/botan,randombit/botan,randombit/botan,randombit/botan,webmaster128/botan,webmaster128/botan,webmaster128/botan