No one has seen it. It was said that the song ruined the pacing of the film. Which is usually code for 'it sucked'. It couldn't have been as bad as that "Suddenly" song from Les Mis.
It was in the early screenings of the film (not screeners). The song wasn't bad. The tone was just wrong for where it was in the movie. Meryl was very good in performing it. It just wasn't needed.