"Path must be a string" error if there's no tmp dir in env

[cheeaun]

Regarding the latest change here: 494e723#diff-f16acefe4b6553580c43edab685f50f3R87

In my case process.env.TMPDIR || process.env.npm_config_tmp returns an undefined value which causes a Path must be a string error when the value is passed into path.join method here:

node-chromedriver/install.js

Line 93 in 494e723

var candidatePath = path.join(candidateTmpDirs[i], 'chromedriver');

I can open a PR but not sure what's a good "fallback" value, probably process.env.TMPDIR || process.env.npm_config_tmp || ''?

[giggio]

Fixed and published now as 2.27.2.

[lock]

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