[tall] Preserve blank line between elements in list?

[munificent]

In the new tall style, it will currently preserve a blank line before a comment inside a list, as in:

stuff = [
  element,

  // blank line before this
  element,
];

But if there is a blank between elements with no comment, the blank line is discarded. So this:

stuff = [
  element,

  element,
];

Becomes:

stuff = [
  element,
  element,
];

Should we allow a discretionary newline in there and preserve it? The old style does.