Beloved country Willie Nelson scrapped performances on his Outlaw Music Festival Tour, sparking new fears for the 91-year-old guitar strummer, RadarOnline.com has learned. Just hours before the tour’s June 21 kickoff, Willie was feeling ill and bowed out due to “doctor’s orders.” The show went on without him, with his son Lukas Nelson and the Family Band playing a lot of the long-haired legend’s classics. “Willie Nelson is looking forward to seeing everyone in Camden on July 4. He will not be performing in Mansfield today,” his team shared in a recent statement. Willie was slated to be back On…