message: Null-guard m.video info
  Fixes
diff: @@ -79,7 +79,7 @@ module.exports = React.createClass({
  const content = this.props.mxEvent.getContent();
  if (content.file !== undefined) {
  return this.state.decryptedThumbnailUrl;
  - } else if (content.info.thumbnail_url) {
  + } else if (content.info && content.info.thumbnail_url) {
  return MatrixClientPeg.get().mxcUrlToHttp(content.info.thumbnail_url);
  } else {
  return null;
  