message: Null check on thumbnail_file
diff: @@ -88,7 +88,7 @@ module.exports = createReactClass({
  const content = this.props.mxEvent.getContent();
  if (content.file !== undefined && this.state.decryptedUrl === null) {
  let thumbnailPromise = Promise.resolve(null);
  - if (content.info.thumbnail_file) {
  + if (content.info && content.info.thumbnail_file) {
  thumbnailPromise = decryptFile(
  content.info.thumbnail_file,
  ).then(function(blob) {
  