LOS ANGELES (CBSLA.COM) An exhibit of John Lennon sketches will go on display Friday at a Robertson Boulevard gallery, where his widow, Yoko Ono, will offer prints of three drawings for sale.The exhibit opens Friday at Legacy Fine Art, 101 N. Robertson Blvd., and runs through the weekend. The three prints available are Im One of Your Biggest Fans, The City in My Heart and Happy Xmas.Introducing the Bag One Arts program...