child_process: spawn ignores options in case args is undefined

spawn method ignores 3-d argument 'options' in case
the second one 'args' equals to 'undefined'.

Fixes: https://github.com/nodejs/node/issues/24912

PR-URL: https://github.com/nodejs/node/pull/24913


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>