Menu 折叠时，MenuItem未指定 title或内容为空，仍然会有空的 tooltip

[tomgao365]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.6.3

Environment

Chrome 83
windows 10

Reproduction link

Steps to reproduce

      <a-menu-item key="1">
        <a-icon type="pie-chart"/>
        <!-- <span>Option 1</span> -->
      </a-menu-item>
      <a-menu-item key="2" :title="false">
        <a-icon type="desktop"/>
        <span>Option 2</span>
      </a-menu-item>

What is expected?

当菜单折叠时不应该显示 tooltip

ant-design-vue/components/menu/MenuItem.jsx

Line 24 in 9195ba5

const tooltipProps = {

What is actually happening?

仍然有tooltip
1.title 设置为 false,null，有内容；显示 Option 2 为 tooltip
1.title 设置为 false,null，无内容；显示空的 tooltip

[github-actions]

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