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Silence a warning given when running git difftool --dir-diff and there are no changes. This is because command_oneline returns undef when the command has no output, not ''. Signed-off-by: Ross Lagerwall <rosslagerwall@gmail.com> Acked-by: David Aguilar <davvid@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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