[Android] 子组件created触发$emit()事件会导致父组件渲染奔溃

子组件created触发
this.$emit('getHeaderHeight', height)

父组件接收
getHeaderHeight (height) {
this.headerHeight = height
}

注：headerHeight 在页面中使用，未使用的情况下不会出错，且height是number类型一定有值，headerHeight已在data内初始为0。

不知道是否跟weex渲染逻辑有关系？

Start by reproducing the Android case described in the issue: emit getHeaderHeight from the child created hook while the parent uses headerHeight in its page. Compare behavior when headerHeight is used and unused, and confirm the rendering crash with a numeric height. Done means the parent renders without crashing in the reported case.

Written by the indexing model from the issue text.