修复编译问题

themes/example/components/Footer.js

@@ -19,7 +19,7 @@ export const Footer = (props) => {
   //       <span className="px-1 busuanzi_value_site_uv"> </span>{' '}
   //     </span>
   //     <br />
-  //     <h1>{meta?.title || siteInfo.title}</h1>
+  //     <h1>{meta?.title || siteInfo?.title}</h1>
   //     <span className='text-xs font-serif'>
   //       Powered by{' '}
   //       <a

themes/fukasawa/components/AsideLeft.js

@@ -25,7 +25,7 @@ function AsideLeft (props) {
 
     <section className='flex flex-col dark:text-gray-300'>
       <hr className='w-12 my-8' />
-      { siteInfo.description }
+      { siteInfo?.description }
     </section>
 
     {router.asPath !== '/tag' && <section className='flex flex-col'>

themes/hexo/components/Header.js

@@ -107,7 +107,7 @@ const Header = props => {
       }}
     >
       <div className="absolute flex flex-col h-full items-center justify-center w-full font-sans">
-        <div className='text-4xl md:text-5xl text-white shadow-text'>{siteInfo.title}</div>
+        <div className='text-4xl md:text-5xl text-white shadow-text'>{siteInfo?.title}</div>
         <div className='mt-2 h-12 items-center text-center shadow-text text-white text-lg'>
           <span id='typed'/>
         </div>