Updated sidebar to be disabled if no current user

app/javascript/gabsocial/features/ui/index.js

@@ -540,7 +540,7 @@ class UI extends React.PureComponent {
           <LoadingBarContainer className='loading-bar' />
           <ModalContainer />
           <UploadArea active={draggingOver} onClose={this.closeUploadModal} />
-          <SidebarMenu />
+          { me && <SidebarMenu />}
         </div>
       </HotKeys>
     );