message: fix access of element [0] of array even though it sometimes does not exist
diff: @@ -142,7 +142,7 @@ export default class ReplyThread extends React.Component {
  // Part of Replies fallback support
  static stripPlainReply(body) {
  const lines = body.split('\n');
  - while (lines[0].startsWith('> ')) lines.shift();
  + while (lines.length && lines[0].startsWith('> ')) lines.shift();
  return lines.join('\n');
  }
  