Merge pull request #7573 from poettering/empty-to-null
authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Thu, 7 Dec 2017 20:04:53 +0000 (21:04 +0100)
committerGitHub <noreply@github.com>
Thu, 7 Dec 2017 20:04:53 +0000 (21:04 +0100)
use empty_to_null() where we can


Trivial merge