[[FIX]] Skip undefined env in getHomeDir() #3245
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Skip calling
fs.existsSync()
on an environment variable when it is undefined.Discovered during the CITGM run of nodejs/node#18308
https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/1229/nodes=fedora-latest-x64/testReport/junit/(root)/citgm/bluebird_v3_5_1/
Before this patch, if
fs.existsSync(undefined)
throws, the test would fail like this: