部分文章substr报错
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glore commented
导致数据显示不出来， 报错如下：
VM114 bundle.js:28 Uncaught (in promise) TypeError: Cannot read property 'substr' of null
at VM114 bundle.js:28
at Array.map ()
at t.value (VM114 bundle.js:28)
at c._renderValidatedComponentWithoutOwnerOrContext (VM114 bundle.js:23)
at c._renderValidatedComponent (VM114 bundle.js:23)
at c._updateRenderedComponent (VM114 bundle.js:23)
at c._performComponentUpdate (VM114 bundle.js:23)
at c.updateComponent (VM114 bundle.js:23)
at c.receiveComponent (VM114 bundle.js:23)
at Object.receiveComponent (VM114 bundle.js:6)