Move not (host or instance) check before (host and instance) check
#196
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When `host` is an empty string while `instance` is not specified, `(host and instance) is not None` will return `True` because `(host and instance)` will evaluate to `''`. In this case the error message returned will be inappropriate and confusing because the caller didn't specify `host`.
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When
hostis an empty string whileinstanceis not specified,(host and instance) is not Nonewill returnTruebecause(host and instance)will evaluate to''. In this case the error message returned will be inappropriate and confusing because the caller didn't specifyhost.