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@ -127,7 +127,10 @@ export const removePropertyOf = function(obj){
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export function removeTree(list) {
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var this_ = this
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for (var i in list) {
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if (list[i].children.length == 0) {
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if (list[i].children == null) {
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delete list[i].children;
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}
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else if (list[i].children.length == 0) {
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list[i].children = undefined
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} else {
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this_.removeTree(list[i].children)
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