Show Better feedback once countdown has expired

[henrybeen]

I'd request an improvement to the experience after the countdown has reached zero. I understand you do not plan to support negative numbers, sure. But even displaying the widget Title and a statement saying something to the effect of "This countdown has expired" or "Time's up!" or even "2020-Feb-14 17:00:00 is in the past" would be an improvement over "Countdown: Sorry, nothing to show"