bug: 布局文章列表单条模式显示内容不全

[yankooo]

类似这样单条模式，为什么右边总是空出一大部分空白，应该是适配没做好？还是特性就是这样？

[ruibaby]

应该是因为文章没有设置封面图导致的，可以优化下。

/kind improvement
/good-first-issue

[f2c-ci-robot]

@ruibaby:
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In response to this:

应该是因为文章没有设置封面图导致的，可以优化以下。

/kind improvement
/good-first-issue

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[chenkuicn]

后续优化文章单条布局时，可以选择封面图的位置，居左或者居右