If you had no money in a traditional IRA on December 31, 2017, that's what you tell TurboTax.
An outstanding rollover is a distribution that you received before year-end but you rolled back into a traditional IRA after year-end, within 60 days of the distribution.
If you had a zero traditional IRA balance on December 31, 2017, your basis carried forward to 2018 is zero. You should see a zero on line 14 of your 2017 Form 8606.
