nl: show error if --join-blank-lines is zero#5103
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sylvestre merged 1 commit intouutils:mainfrom Jul 25, 2023
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GNU
nlshows an "invalid line number of blank lines" error if-l/--join-blank-linesis0whereas uutilsnldoesn't fail. This PR fixes this issue. Plus adds a test for when an invalid value is specified for-l/--join-blank-lines.