Depending on your record, most jurisdictions will give you the opportunity to dismiss a ticket like this, especially if you already have proof of registration. You should address this with the judge at your court hearing or hire a local attorney to handle it for you.
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If you have a date to appear, do so with the current registration in hand to show the court. The ticket should be dismissed. That said, part of complying with the law is to have the proper registration AND to display it. So the court might not be lenient if when you show to court you still have not replaced the windshield and applied the sticker. I suggest going and getting the windshield now and showing the court that you were just about to do it when cited. That should guarantee a dismissal of the ticket.