I remember doing the Evil Dead house and there was no one in it lol
it has happened a couple of times for me, in 2007 I remember the Home for the Holidays being alone too (Im sure the actors were in the boo holes but maybe they were getting ready to work after coming from break ) I think Saws and Steam also had it happened
there have been at least 2 more times when there was no one coming out, I think one of the walking dead houses too.
I just felt super bad for the people around me, (Specially if someone uses express and the house is empty.)