remove unnecessary code

packages/app/src/components/Page/DisplaySwitcher.tsx

@@ -115,7 +115,6 @@ const DisplaySwitcher = (): JSX.Element => {
             <div className="flex-grow-1 flex-basis-0 mw-0">
               { isUserPage && <UserInfo pageUser={pageUser} />}
               { !isNotFound && <Page /> }
-              { !isNotFound && revision != null && isPopulated(revision) && revision.body }
               { isNotFound && <NotFoundPage /> }
             </div>
 

packages/app/src/components/Page/RevisionBody.jsx

@@ -73,7 +73,6 @@ export default class RevisionBody extends React.PureComponent {
 
 RevisionBody.propTypes = {
   html: PropTypes.string,
-  isMathJaxEnabled: PropTypes.bool,
   renderMathJaxOnInit: PropTypes.bool,
   renderMathJaxInRealtime: PropTypes.bool,
   additionalClassName: PropTypes.string,

packages/app/src/components/PageEditor/Preview.tsx

@@ -19,7 +19,6 @@ type Props = {
   growiRenderer: GrowiRenderer,
   markdown?: string,
   pagePath?: string,
-  isMathJaxEnabled?: boolean,
   renderMathJaxOnInit?: boolean,
   onScroll?: (scrollTop: number) => void,
 }