fix(input-number): don't use this.inputRef when the component is already unmounted
#4103
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当input-number有焦点的时候，移除组件（unmount）时会首先触发blur事件，但是在blur里面使用了input框的ref，会导致报错。
既然用户已经移除了组件，肯定也不会希望收到blur事件。我觉得在ref为空时忽略掉blur事件就可以了
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