Comments inside empty blocks get uncommented

I'm getting a bug where running the formatter is making the code invalid.

Example code:

```ruby
foo %i[
  bar
  baz
  qux
], kwarg: {
  # TODO: fill me in
}
```

After formatting:
```ruby
foo %i[
    bar
    baz
    qux
  ], kwarg: {
 TODO: fill me in
         }
```