Hulu's 'Happiest Season' is a holiday treat spiked with melancholy

One of the first things we learn about Abby (Kristen Stewart) in Happiest Season is that she's largely indifferent to Christmas — which means it doesn't take a genius to figure out she'll be at least somewhat on board with the holiday by the end of this holiday dramedy. 

But the road that Happiest Season takes to get there...