I was on the 8-2 mission "The Rotting Metropolis" and wandered into some spikes at the end of the mission. I lost my last health bar and was poisoned. However, I did not die. Here's the screenshot:
http://i1276.photobucket.com/albums/y476/mrmightymoose/0health_zps6e8887...
Hope you can fix this or tell me if this is the way it's supposed to be :/
~ Cloudfall (alt. Fall-Of-Spring)
It's likely that you have the minimum amount of health possible, but with how the new UI is you can't distinguish it from no health at all. If you feel that this is a bug then press F2 in-game to report it.