The actress Catherine O'Hara, who died Friday, conjured up comedy wherever she went, as an at-wit's-end mom in "Home Alone," a quirky former soap opera star on "Schitt's Creek," a core member of director Christopher Guest's repertory ensemble and a go-to guest star in pretty much any funny TV show in recent decades ("Curb Your Enthusiasm," "30 Rock," "Modern Family," "The Larry Sanders Show," the list goes on).