My original thinking was that when we go to show the "no rules" message, if the user creates a stylesheet in between the time the inline editor was opened and the time we show the message, we'd want to know that and show the other message. However, we'd have to do other work to detect that and refresh the message/re-enable the button anyhow (which we're not doing currently). I think we should do that, but it's a separate task.