When a user interacts with an analysis - there is always a likelihood they will make selections that result in no data being returned.
Currently - this makes map go all weird and tiny; charts show wierd vertical lines, etc.
Could you provide an option in the General or Data tab that allows the user to either specify a message that shows in place of the visualisation when it contains no data OR even better - display a background image with a message over the top. That way we can make it look really polished!