Christmas is coming, and Cat has a hunch he's not on Santa's "nice" list. Which means? No presents for Cat. So he tries to be good, but Cat and tree-decorating don't exactly mix, and children, it seems, aren't wild for his brand of gift-giving. Still, this holiday, Cat might surprise even himself with his generosity and leave the Grinchiest of readers laughing. Best of all, he may just get to m…