Maya Rudolph is brilliant, but the general “SNL” audience considers her part of the family and not a guest host. Jack Harlow is unknown to just about everyone as a white rapper, and isn’t a draw. These are the lessons learned from last night’s show as “SNL” had the lowest recorded ratings in over a decade. Going back to 2009 you can’t find a 3.6 million rating. But that’s what happened as Rudolph — albeit wonderful– hosted, and Harlow performed. The show lost 500,000 viewers from its last airing on February 27th. Post-election, “SNL” has been averaging around 4.1 million....