U dont need a noun. I've seen / heard быть + adjective. It happens all the time.
"Did you go to the party ? Yes it was bad!"
Ты пошёл на вечеринку ? Да, была плохая(ой?).
In english you have "it" But u don't need it in russian.
@ waxwing - Yes, you can explain please.
@blackmage so sweet.
@ all of you who think that you speak better russian than someone else because your teacher spent more money at a university than the others did, well then eat this.
My teacher is a native speaker from kazakhstan. It just DOESN'T get any sweeter than that. мы с ней смеемся над твоей учительницей and 8 year PHD