a few optimizations to clean_node
a few optimizations to clean_node

vakata/jstree,aihua/jstree,jacksonpradolima/jstree,iCasa/jstree,iCasa/jstree,samokspv/jstree,aihua/jstree,Project-TF/jstree,jacksonpradolima/jstree,neogis-de/jstree,beealone/jstree,samokspv/jstree,ninvfeng/jstree,Contagious06/jstree,duzun/jstree,Project-TF/jstree,codio/jstree,opencmii/jstree,sadfuzzy/jstree,JuseChen/jstree,ninvfeng/jstree,iCasa/jstree,gustavobg/jstree,gustavobg/jstree,JuseChen/jstree,Aliccer/jstree,Aliccer/jstree,opencmii/jstree,Contagious06/jstree,vakata/jstree,JuseChen/jstree,500tech/jstree,beealone/jstree,AnuchitPrasertsang/jstree,500tech/jstree,neogis-de/jstree,Contagious06/jstree,duzun/jstree,ninvfeng/jstree,sadfuzzy/jstree,sadfuzzy/jstree,gustavobg/jstree,jacksonpradolima/jstree,codio/jstree,neogis-de/jstree,500tech/jstree,Aliccer/jstree,opencmii/jstree,beealone/jstree,samokspv/jstree,aihua/jstree,AnuchitPrasertsang/jstree