fix(使所有主题的404能够正常运转)

(cherry picked from commit 3e3b7667d043522a3d782b804815b8f1683127d1)

themes/commerce/index.js

@@ -246,7 +246,7 @@ const LayoutSlug = props => {
       <div className='w-full max-w-screen-xl mx-auto lg:hover:shadow lg:border lg:px-2 lg:py-4 bg-white dark:bg-hexo-black-gray dark:border-black article'>
         {lock && <ArticleLock validPassword={validPassword} />}
 
-        {!lock && (
+        {!lock && post && (
           <div
             id='article-wrapper'
             className='overflow-x-auto flex-grow mx-auto md:w-full md:px-5 '>