Once you realize Noir is a Style rather than a sub genre of Crime, you'll see it. Just look at the Pottersville sequence from It's A Wonderful Life 1946) nobody is calling that film a Noir but that Pottersville sequence is filmed in the Noir Style.
https://www.youtube.com/watch?v=xXQhTmNDTGo
Yeah, the scene is shot in
noir style, so the movie is noir? Of course, not. That proves that it takes more than style to make a
noir (or
neo-noir). That movie is as anti-noir as can be, isn't it? And that goes also for other movies which may have a
noir visual style. I think
noir is a sub-genre of crime for a series of reasons (main one being a dark vision of reality). So, in my book, a happy ending is sufficient not to classify a movie as
noir. But it's useless to discuss, we'd never agree. And apart from that I can't remember this movie being visually
noirish, but I'l have to re-watch it.