In a Flow Board, trying to thank a user with a bot-flag, triggered a "Thank action failed. Please try again." pop-up.
We should either:
Remove the "Thank" button for posts made by a user with the bot-flag;
or, Improve the error message (e.g. "Bots cannot be thanked directly, please send your appreciation to the bot-owner.").
Probably the first (for consistency with Thank in wikitext history pages).