Fix duplicate meta description in blogstpot

fix-duplicate-meta-description2.html

<b:if cond='data:blog.url != data:blog.homepageUrl'>
<b:if cond='data:blog.pageType != &quot;item&quot;'>
<b:if cond='data:blog.metaDescription != &quot;&quot;'>
<meta expr:content='data:blog.metaDescription' name='description'/>
</b:if>
</b:if>
</b:if>