fix: ensure view measurer exists #295
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获取
viewRect时确认view measurer存在与 document 上。场景：
在微前端场景下，基座和子应用都使用了
vueuc，子应用先渲染VFollower，此时会先在子应用中创建view measurer。之后基座再渲染VFollower，此时会查询到子应用创建的view measurer并缓存。如果之后切换子应用，
view measurer被移除，此时基座的VFollower渲染就会存在异常。