Bug: empty reviews can be published, and draft review banner is shown when review is empty.

My change: a review cannot published if: "Ship it" is not checked & header is empty & no comment & footer is empty.

Open an empty review dialog, and close it.
Type something in header, click "cancel", then close the review dialog.
Add a new comment, type something, click "cancel", then close the review dialog.
Type something in footer, click "cancel", then close the review dialog.
Type and save text in header & footer, add a non-empty comment, delete them all, then close the review dialog.