fix: 双端比较在非理想情况时, 获取 idxInOld 需要判断 node 是否为空#298
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dziin wants to merge 1 commit intoHcySunYang:masterfrom
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fix: 双端比较在非理想情况时, 获取 idxInOld 需要判断 node 是否为空#298dziin wants to merge 1 commit intoHcySunYang:masterfrom
dziin wants to merge 1 commit intoHcySunYang:masterfrom
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idxInOld存在的时候，prevChildren[idxInOld] = undefined，在下次循环查找idxInOld的时候，prevChildren中可能会有空值