message: fix missing null-guard
diff: @@ -437,7 +437,7 @@ export function bodyToHtml(content, highlights, opts={}) {
  }
  let formattedBody = content.formatted_body;
  - if (opts.stripReplyFallback) formattedBody = ReplyThread.stripHTMLReply(content.formatted_body);
  + if (opts.stripReplyFallback && formattedBody) formattedBody = ReplyThread.stripHTMLReply(formattedBody);
  strippedBody = opts.stripReplyFallback ? ReplyThread.stripPlainReply(content.body) : content.body;
  bodyHasEmoji = containsEmoji(isHtml ? formattedBody : content.body);
  