PARIS (Reuters) – The Mona Lisa was left shaken but unharmed on Sunday when a visitor to the Louvre tried to smash the glass protecting the world’s most famous painting before smearing cream across its surface in an apparent climate-related publicity stunt. The perpetrator was a man disguised as an old lady who jumped out of a wheelchair before attacking the glass. “Maybe this is just nuts to me…,” posted the author of a video of the incident’s aftermath that shows a Louvre staffer cleaning the glass. “(He) then proceeds to smear cake on the glass, and throws roses everywhere before being ta…