[how to reproduce]
when running the "WSUS Offline Update 11.8 - Installer" with "shut down on completion" checked, it does -not- shutdown when "No missing update found. Nothing to do!" and then leaves the computer up and running (the whole night).
[expected behaviour]
when running the "WSUS Offline Update 11.8 - Installer" with "shut down on completion" checked, it always shuts down when completed, even when "no missing update found".
It would be nice to give the user the option to -not- shutdown at that very moment, and if the user then does not respond within a minute the system should shutdown.