Had to look this one up. According to Cameron:

"And I said, ‘Honestly, if I had a choice between that piece of shit and just an all-black frame, I’d go with the all black frame.’ And apparently what happened was I walked out of the office and he called somebody up and said ‘He wants it all black!’ He wasn’t hearing what I was saying. So if you ever wondered why there was literally nothing on the one sheet for Aliens, that’s why.”

I mean, it works!