Having no refund does not necessarily mean that you do not have to file. The filing requirements do not depend on whether you are getting a refund. And there are reasons to file even if you are not required to. TurboTax cannot assume that if there is no refund you do not have to file.
You can go to the following link on the IRS web site to determine whether you are required to file.
Do I Need to File a Tax Return?
