args: add new UnknownCommandError type
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This commit makes unknown commands a proper error type so that the caller can check for this specific error type without having to do string comparisons. This is useful in the context of spf13#823 Signed-off-by: Michael Vogt <mvogt@redhat.com> Signed-off-by: Michael Vogt <michael.vogt@gmail.com>
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This commit makes unknown commands a proper error type so that the caller can check for this specific error type without having to do string comparisons.
This is useful in the context of #823