CHASKA, Minn. >> Dustin Johnson made an exception to his rule of never watching golf on television, only because it was the Ryder Cup."That was the only thing I missed," Johnson said.The best player this week at Hazeltine, he was nowhere to be found two years ago at Gleneagles.Amid a published report that Johnson twice tested positive for drugs, he took a six-month break from golf to seek help for what he described as "personal challenges.