Fixed picture in picture compatibility error in WebUI when status is deleted

app/javascript/mastodon/features/picture_in_picture/components/footer.js

@@ -121,6 +121,13 @@ class Footer extends ImmutablePureComponent {
   render () {
     const { status, intl, withOpenButton } = this.props;
 
+    if (status == null) {
+      return (
+        <div className='picture-in-picture__footer'>
+        </div>
+      );
+    }
+
     const publicStatus  = ['public', 'unlisted'].includes(status.get('visibility'));
     const reblogPrivate = status.getIn(['account', 'id']) === me && status.get('visibility') === 'private';