“Life has a gap in it,” says Sarah Silverman, as Gerdaline, a recovering alcoholic. “You don’t go crazy trying to fill it, like some lunatic.” This is the conflict Sarah Polley’s poignant and sobering film, Take This Waltz, wrestles with, as it takes a look at the human fear of the in between places in time. Michelle Williams is pitch-perfect as Margot, a young freelance writer, who the effortlessly seductive Daniel (Luke Kirby) describes as, “restless in a kind of permanent way.” Margot is married to Lou (Seth Rogan), a cookbook author whose specialty is chicken. There is nothing terribly wrong with Margot and Lou’s (Seth Rogan) relationship. In fact,…