Change author_account to be authors in REST API (#30846)

app/javascript/mastodon/features/explore/components/author_link.jsx

@@ -8,6 +8,10 @@ import { useAppSelector } from 'mastodon/store';
 export const AuthorLink = ({ accountId }) => {
   const account = useAppSelector(state => state.getIn(['accounts', accountId]));
 
+  if (!account) {
+    return null;
+  }
+
   return (
     <Link to={`/@${account.get('acct')}`} className='story__details__shared__author-link' data-hover-card-account={accountId}>
       <Avatar account={account} size={16} />