CBS gave “Jericho” a second chance. The show won’t get a third. CBS canceled the nuclear aftermath drama for a second time, meaning the March 25 episode will wrap up the series storyline. “Jericho” producers shot two final episodes, one that would lead into a hoped-for third season. Second-season ratings were poor and the show was probably doomed from the start by an abbreviated run and a reduced budget. “Jericho” fans, whose passionate campaign caused CBS to give the show a second life, shouldn’t be disappointed. They achieved a victory by getting the show back on the air.