I have no balance due and no refund on my D..C. tax return. I did not get a copy of the return (FORM D-40B). Do I need a copy of the DC return to file or not?

My question is not about the Federal Return. It is about the 2017 District of Columbia return. When printing the return, I got only the directions for filing it.  How do I get a copy of the finished return to mail?  Or do I need to mail a DC return since I have no refund and have no balance due?