Tree Select placeholder's style problem, when all node unchecked

[LiuuY]

What you did

Your official web site(http://ant.design/#/components/tree-select),
'multiple: true' version,
when I unchecked all tree nodes:

In my project, i have same problem.

Online demo

http://ant.design/#/components/tree-select

Environment Information

• The version of antd: 1.0.0
• Your operating system and it's version(e.g. windows 10):
• Your browser and it's version(e.g. Chrome 50.0.2661.94 m):

[warmhug]

@afc163 select样式改了吧？

select 组件后来承玉升级过、tree-select 没跟进升级。目前 select 和 tree-select 还是分开维护好，功能上已经有几个地方不一致了。样式虽然大多都一样，但估计还有些地方是不一样。

[lock]

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