logrotate: do not rotate empty logs (2nd logrotate file)

Signed-off-by: Dmitry Smirnov <onlyjob@member.fsf.org>
Merge pull request #1542 from onlyjob/debian

logrotate: do not rotate empty logs (2nd logrotate file)

Reviewed-by: Josh Durgin <josh.durgin@inktank.com>