alt Hacker NewsIt may found in usage, but then so is "liek"..
At the end of the day there is accepted grammar and there is actual usage.
If you ask people for the accepted grammar they will give you something most people accept. Which is not "What if there were no star in the sky?"
At the end of the day there is only "the reader understands" and "the reader does not understand", with the former being the goal of the author. There is some benefit in using what is conventional to help achieve the desired outcome, but beyond that it matters not.