message: don't append extra newline after blockquote anymore
  now that P prepends newline when not first element
diff: @@ -206,10 +206,6 @@ function parseHtmlMessage(html, partCreator, isQuotedMessage) {
  parts.push(...newParts);
  - // extra newline after quote, only if there something behind it...
  - if (lastNode && lastNode.nodeName === "BLOCKQUOTE") {
  - parts.push(partCreator.newline());
  - }
  const decend = checkDecendInto(n);
  // when not decending (like for PRE), onNodeLeave won't be called to set lastNode
  // so do that here.
  