Remove null values in Visitor.prototype.visitArray.
Remove null values in Visitor.prototype.visitArray.

Returning null is now a pretty good alternative to calling this.remove().

rwaldron/recast,benjamn/recast,kyldvs/recast,marcioj/recast,cpojer/recast,fkling/recast,shumov/recast,stefanpenner/recast,kassens/recast,benjamn/recast,benjamn/recast,ersengultepe/recast,ipeychev/recast