fix: Fix crash when using a client credential without any paths or env_vars set #296
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We have some test cases in ruby-docs-samples that use Credentials classes without ever setting paths or env_vars. (This is not a valid production case, but we do run into it in some of our tests in other repos.) It causes an exception because the recent change to "inherit" these values from superclasses, causes the field to default to
nil
rather than the empty array. Fixed. Also updated the yardocs to make this more clear.