I did not receive a K-1 for 2017. My ownership as of 12/31/16 was zero. The software keeps asking me to enter info but I have none. What can I do?

The K-1 is still in your tax file, just carried over from last year to make sure you didn't miss it if it still applied.

You will have to delete it from this year's tax file

See: How do I delete forms in TurboTax Online?

After deleting it, log out of the program. When you log back in, use the Delete a Form tool (List of Forms in My Return) to confirm it has been removed from your return.