No results found option

https://github.com/twitter/typeahead.js/issues/780

> I know that I can specify an empty template for each dataset, but I have 6 or 7 datasets and I would like to specify something to be displayed when none of the datasets have hits.
>
> If I just type in "4q8nywrfxm", I don't want to see 6 datasets all saying that they can't find that text, I just want one message, specified at the typeahead level (not the dataset level).
>
> Does that make sense?

I copied this over from the old repo which I was using until I realized it's no longer maintained. Sorry if this is a dup or if it was already fixed but I couldn't find that it was.