Geeze… spoiler that shit anon!
I'm no expert on it, but, everything is supposed to have mass, even gasses. Theoretically, anyway. Measuring the mass of light is probably like measuring the height of a sheet of paper, or a molecule of water.
Would have to assume though, lasers also being a light must have some sort of mass to them if they can cut through metal, wouldn't we?
5:5!