fix(core - patch)：when before patch: old keys like [a, b, c ...] new …
Created by: sam0212
…keys like [d, b, b, e, ....], when patch the second key "b" Vnode by new children, the vnodeToMove will be undefined, so need add a condition for vnodeToMove
fix an error when diff patch, when before patch: old keys like [a, b, c ...] new keys like [d, b, b, e, ....], when patch the second key "b" Vnode by new children, the vnodeToMove will be undefined, so need add a condition for vnodeToMove
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