Editor's mail with no reviewer's comment
Instead of trying to second-guess what might have happened you should simply contact the editors and ask what revisions they wish to see you perform. The reasons for the lack of information could be any of the suggestions given but could also be a mistake, an attachment that was not passed on or a mail sent by one person who has not seen your recently provided update, the list of possibilities is long.

So, e-mail the editor or journal and briefly explain what you received and how the lack of information makes revisions impossible.