During a reboot or shutdown the display remains on, it is possible to respond to the sigterm and display a reboot system instead of the clock, or simply reset the display
Another person also requested this, and I pushed a fix for it a couple of days ago. If you grab the latest changes then the display should now be cleared when mpd_oled terminates.
During a reboot or shutdown the display remains on, it is possible to respond to the sigterm and display a reboot system instead of the clock, or simply reset the display