But why not just take an action? I have so many plays in Scythe and never had nothing to do. You always have a spare coin to bolster or move your popularity up.
And that's only if "Move" is the one you want to switch off of and have no factory card.
If you're on any other action and you want to just take an empty turn, why not go for "Gain" and take two coins for it?
I've played a lot and seen it happen once (to me). Screwed up my planning during the opening and ended up with zero coins, no power, and my pawn already on Move. Wasn't paying enough attention to my coin pile because I don't think I'd seen it actually reach zero before (I suspect I forgot to take coins from an earlier bottom-row action.)