[Bar Plot tests] Move cleanup code to conditional afterEach()
[Bar Plot tests] Move cleanup code to conditional afterEach()

NextTuesday/plottable,palantir/plottable,softwords/plottable,NextTuesday/plottable,palantir/plottable,palantir/plottable,softwords/plottable,palantir/plottable,NextTuesday/plottable,softwords/plottable