SAVANNAH — No Vidalia onion will be harvested before its time. So says the agricultural commissioner who claims farmers should face fines for shipping one of Georgia's premier crops too early, potentially threatening their renowned sweet, delectable taste. But one of the state's most prominent farmers is going to court to fight the new rules, claiming the commissioner is overstepping his bounds and that onions are being shipped only when they're ready and only after federal inspectors give the high sign.