Art can literally be anything you want it to. That is the meaning of art. It’s in both the viewer and the artist - if you believe it’s art then it is. With this definition, it doesn’t matter if there’s a message if the art you define breaks the bounds of what is conceived as commercially “art.” So if you find meaning in a piece that the artist did not intent to have meaning/message, I don’t think that undermines the integrity of the art.