Matthew Gilbert’s notes on the weekend’s TV offerings, including “Finding Mrs. Claus” on Sunday at 9 p.m. on Lifetime; “Boardwalk Empire” on Sunday at 9 p.m. on HBO; “Dexter” on Sunday at 9 p.m. on Showtime; “The Good Wife” on Sunday at 9:30 p.m. on Channel 4; and “Oprah’s Next Chapter” on Sunday at 9 p.m. on OWN.
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