The hangout sitcom has a few, set-in-stone principles: an attractive, charming cast, struggling to balance the demands of work and love, wrangling an array of neuroses and errors of judgment. When their professional and personal worlds begin to overlap, the narrative ought to become funnier and deeper. Unfortunately, “Not Suitable for Work,” like creator Mindy Kaling’s previous sitcom offerings, offers too many cliches to result in anything other than mediocrity.