If you have to ask, throw it out.

I would eat it. I have done this with left out chicken soup many times.

Perfectly fine.

I wouldn't eat it and I have a pretty iron stomach.

What's interesting is how many of these posts there are. People seem to leave food out at all night by mistake all the time. Maybe part of the nighttime routine needs to be a pass through the kitchen to put dinner, or whatever, away.