For anyone lucky enough to have experienced the long arc of his career, the death of droll, dry, deadpan Martin Mull, Thursday at 80, feels like the end of an era. On the spun-off “Fernwood 2 Night,” Mull and Fred Willard, as confidently dim sidekick Jerry Hubbard, created a telepathic double act in which they could seem antithetical expressions of …
