doc: child_process: clarify `subprocess.pid` can be `undefined` when `ENOENT`#37014

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aduh95 merged 2 commits intonodejs:masterfrom dr-js:doc-subprocess-pid

Feb 22, 2021

+26-14

Commits on Feb 22, 2021

doc,child_process: pid can be undefined when ENOENT

dr-js
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aduh95
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test,child_process: add check for subProcess.pid

dr-js
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aduh95
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