Weird line break in empty attrsets

[piegamesde]

Description

Found by @Atemu. Needs to be bisected, but I strongly suspect that this is a regression of #224

Small example input

{
  foo = {
  };
}

Expected output

no change, or

{
  foo = { };
}

Actual output

{
  foo =
    {
    };
}

[dasJ]

Duplicate of #253 ?

[piegamesde]

Unclear, but likely. The other bug looks really similar, but all examples use function applications while this one is directly on an attrset, which is special cased and thus a different code path. So maybe keep this one open in case a fix for one doesn't also fix the other.

[piegamesde]

Duplicate of #253