Align the code with the documentation and similar methods used to
execute os commands - the `args` argument should be optional, and if
omitted, treated as an empty array (`[]`).
Fixes: https://github.com/nodejs/node/issues/58411
PR-URL: https://github.com/nodejs/node/pull/58412
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Richard Lau <richard.lau@ibm.com>
