Yes, you can leave it blank. You should go in to income and delete the W-2 or TurboTax will remind you that you need to edit it. When you started TurboTax it asked you if you wanted to import information from last year. You could've deleted it then. You probably just missed it. If you are no longer working, if you ONLY have Social Security you do not need to file. Also, if your income other than Social Security is less than your standard deduction you might not need to file. It is worth checking.
