add a status 'undefined' for horizontalAlign and verticalAlign

[hzmsrv]

sometimes we only need the element to drop down without any style like top, width, height...

the default will change those styles directly on the element. it is top level and change in runtime.

so we add this undefined to stop changing.

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[hzmsrv]

I signed it! ᐧ googlebot <notifications@github.com> 于2018年11月2日周五 下午3:31写道：

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[googlebot]

CLAs look good, thanks!