“Wheel of Fortune” announcer Jim Thornton’s attorney claims her client accidentally visited a pedophilia support site while on an airplane. In a letter obtained by Page Six Thursday, Thornton’s attorney, Allison Hart, claims he accidentally clicked on the site by mistake. Thornton has not been arrested or charged in connection with the incident. “My client has become active in suicide-prevention advocacy since losing a close family member to suicide two years ago, and he has spent time visiting chat rooms offering support to individuals suffering from suicidal ideation,” she writes. “One of the sites my client has visited is…