Kate Aurthur editorOver the years, “The Real Housewives of Beverly Hills” — more than the other installments in the Bravo franchise — has struggled to produce story arcs that aren’t dull and drama-free. Its cast, several of whom are actors who know how to exert self-control, have often been overly guarded, and have abstained from orchestrating the unbridled, potentially life-ruining shenanigans offered by some of the other cities.