A corrected Form 1099-R that was issued to show that there was no distribution would have $0.00 (or be blank) in boxes 1 and 2a. It would also have the "Corrected" box check. You only report the corrected 1099-R, which will really be reporting nothing. But enter it and report it. Do not report the original. Once the corrected was issued, it's as if the original never was.