Last comment field in list of topics is incorrect if no comments received #145
Description
Look at https://forum.backdropcms.org/forum/meet-ups-and-events in particular where there are lots of topics with no comments. For some reason, instead of leaving blank or saying N/A, the view gives a fictitious last comment date - at today's date (29th December 2022) it says "3 months 4 weeks ago". This looks very strange when the topic was posted less time ago than that.
