duplicate check if `contenthash` is empty string causes unreachable code

[mendeleden]

Lines 44-48 in set domain check if

  // Get content hash and encode it
  let contenthash = data.contenthash || null;
  let rawContenthash = contenthash;
  if (contenthash === "") {
    contenthash = null;
  }

If contenthash is an empty string, the first conditional yield null which means the conditional check later on is unused/does not cause any changes.