“A Bad Moms Christmas” arrives in theaters just 15 months after last summer’s surprise-hit comedy “Bad Moms,” and it’s as shoddy and slapped-together as it sounds. And I really liked the original, too. But this feels like a waste of some great, veteran talent, including Susan Sarandon and Christine Baranski. Bah humbug, indeed. My RogerEbert.com review.