When it comes to the Warren County economy, there are different types of pain. When Carrier closed, that was a fall-down-the-stairs type of pain. Everything hurt.The announcement Bluegrass Underground is leaving its home at Cumberland Caverns is not such an acute, throbbing pain, but it’s a departure that’s definitely going to leave a mark.When I was at the big Bluegrass Underground taping in March, there was a couple who drove for three days from Canada just to see the weekend shows.