If you have a review page with no reviews, then I'd definitely consider
Or, better yet, have the script that generates the page return an HTTP 404 Not Found status, since that's what such a page essentially is: a placeholder for a missing actual page.
This is e.g. what Wikipedia does if you follow a link to an article that doesn't exist yet (and you don't have permission to create it — otherwise it gives you an edit form, which won't have a 404 status but is
Edit: As it happens, I just came across this relevant recommendation in Google's guidelines on duplicate content:
"Avoid publishing stubs: Users don't like seeing "empty" pages, so avoid placeholders where possible. For example, don't publish pages for which you don't yet have real content. If you do create placeholder pages, use the noindex meta tag to block these pages from being indexed."