Avoid adding empty strings to classList #4340
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The argument to classList.add cannot be an empty string.(see: https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/add)
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这个在 1a12667 已经修复了, 只是还没合到 |
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classList.add 的参数不能有空字符串
见：https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/add#exceptions
（中文文档中没有关于异常的描述）