There are several masechtos included in the printed versions of Talmud Bavli that, in fact, don't have any Bavli on them: Yerushalmi Shekalim, Mishnayos Eduyos, Mishnayos Kinnim, Mishnayos Tamid (for half of the masechta), and Mishnayos Middos.
This question addresses why Shekalim, Kinnim, and Middos are included. Tamid is fairly obvious: once we've started the masechta with Gemara, we might as well finish it, even if the end doesn't have Gemara; there's no need to split the masechta in half.
But why is Eduyos included? Neither of the answers given in the above link help; there's still Avos, which is also in Nezikin but not included in Shas Bavli, so it's not just to round out the Seder. And Eduyos doesn't discuss anything related to the Beis HaMikdash (at least as its primary focus), so that can't be the reason either.