vuex3.1.1版本 unregisterModule方法存在问题

[zjhILYxxq]

卸载一个不存在的动态module

源码:

unregister (path) {
    const parent = this.get(path.slice(0, -1))
    const key = path[path.length - 1]
    if (!parent.getChild(key).runtime) return

    parent.removeChild(key)
  }

如果要 卸载 的 module 在 父module 中不存在， parent.getChild(key) 返回 undefined ，会抛出异常: Cannot read property 'runtime' of undefined。

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