Fixed empty trailhead filtering.
Fixed empty trailhead filtering.

vinh3928/trailsy,JamesGould123/trailsy,mgraesser/trailsy,CodeForBoulder/trailsy,mbarrenecheajr/trailsy,trevorackerman/trailsy,vinh3928/trailsy,JamesGould123/trailsy,trevorackerman/trailsy,mgraesser/trailsy,mbarrenecheajr/trailsy,remory08/trailsy,CodeForBoulder/trailsy,remory08/trailsy