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fix: Exit with code 1 when nyc doesn't know what to do. (#1070)

When nyc is not told to do anything this is an error.  We already
printed the help message to stderr, now we exit with code 1 to indicate
that nyc exited without doing anything.

Add a test to cover this edge case and verify that both `nyc` and `nyc
--help` produce output as expected to stdout and stderr, exit with the
proper code.

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