TRIPP FROHLICHSTEIN / St. Louis television viewers watching KTVI Channel 2 were recently given two sharply different versions of the opening of the area’s first full-sized Tim Horton’s in the St. Louis suburb of Maplewood. Covering the opening of the first location of the chain is appropriate, but in terms of good journalism, Channel 2 provided “the best of times” and the “worst of times” with its coverage. Horton’s is a Canadian chain that sells coffee and pastries and other food items. Staking a St. Louis area foothold with its first store at 7468 Manchester Road in Maplewood was a legitimate news story. On the night of June 22, during the 9 p.m. newscast, Channel 2 anchor Mandy Murphey did a solid story on the event. But a day later, Channel 2’s Lisa Hart offered what seemed to be a commercial for Horton’s during the 11 a.m. newscast.