Don't update disks if no one is listening

It's not very useful to update things that aren't being used.

BUG: 445039
2 jobs for master in 2 minutes and 16 seconds (queued for 1 minute and 5 seconds)
Status Name Job ID Coverage
  Build
passed freebsd_qt515 #164803
FreeBSD

00:00:38

passed suse_tumbleweed_qt515 #164802
Linux

00:01:37