The Front National, as is well-known, doesn't think much of most politicians. Perhaps putting up a deceased candidate was meant as yet another gesture of contempt for "the system." The list leader claims he didn't know his running-mate Marie-Louise J. had died, because he was out of the country. It's possible. To be sure, she was 95 when she was chosen, but the elderly vote disproportionately for the FN, so maybe this was a strategic choice.