Matthew Gilbert’s notes on the weekend’s TV offerings, including the 40th Anniversary American Music Awards” on Sunday at 8 p.m. on Channel 5; “Saturday Night Live” on Saturday at 11:30 p.m. on Channel 7; “Homeland” on Sunday at 10 p.m. on Showtime; “The Good Wife” on Sunday at 9:30 p.m. on Channel 4; and “Breaking Amish: The Shunning Truth” on Sunday at 10 p.m. on TLC.
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