LOS ANGELES -- Eight months after the death of beloved “Jeopardy!” host Alex Trebek, the daily syndicated quiz show chose its executive producer, Mike Richards, as Trebek’s successor over a field of celebrity candidates.But after fan backlash to a selection process that turned messy in recent weeks, producer Sony split the pie by naming another guest host, actor Mayim Bialik, as emcee for “Jeopardy!” primetime and spinoff series, including a new college championship.In another nod to “Jeopardy!”