Ewan McGregor dropped his lightsaber in a ditch while shooting ‘Obi-Wan Kenobi’. The 50-year-old actor – who has reprised his ‘Star Wars’ alter ego for the title role in the new Disney + series – was horrified to fumble his weapon when filming with co-star Moses Ingram and was particularly concerned Hayden Christensen didn’t find out about the mishap because he used to “give him such s***” for not controlling his prop properly when shooting the prequel movies in the early 2000s. Speaking about the 75-foot-wide, 23-foot-high virtual LED set, Moses told Entertainment Weekly magazine: “I forget w…