Fix when functional component render method retrun null (fix #5536)#5539

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yyx990803 merged 3 commits intovuejs:devfrom

gebilaoxiong:fix_render_output_null

Apr 29, 2017

Commits on Apr 29, 2017

fix:create empty vnode when functional component return null

gebilaoxiong
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yyx990803
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add test

gebilaoxiong
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yyx990803
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use isDef
yyx990803
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