make sure 'n' is valid in goTo
make sure 'n' is valid in goTo

LauraHilliger/TimelineJS,NUKnightLab/TimelineJS3,NUKnightLab/TimelineJS3,LauraHilliger/TimelineJS,tkandala/TimelineJS3,NUKnightLab/TimelineJS3,tkandala/TimelineJS3,LauraHilliger/TimelineJS,tkandala/TimelineJS3