fix:修复当loadData执行时赋值给item.children为空数组时，无法选中的bug#6657

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loadData加载出数据之后请将loading属性给删除掉，否则如果加载的children为空数组的时候，会出现当前选项还是个箭头，无法选中的情况，
复现地址：https://codesandbox.io/embed/vue2-vue-js-example-with-cdn-forked-x7hv5h?fontsize=14&hidenavigation=1&theme=dark

加载完“北京”的选项，由于children数组为空，会出现“北京”选项无法选中的情况

fix:修复当loadData执行时赋值给item.children为空数组时，无法选中的bug

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