PHOTO: The Detroit Free Press front page following the Bears-Lions game played on Oct. 24, 1971, at Tiger Stadium. Visit my website homepage, TomShanahan.Report By TOM SHANAHAN The NFL muddled through plans on what to do next after Buffalo Bills safety Damar Hamlin collapsed on the field with a heart attack and was rushed to University of Cincinnati Hospital. If the NFL had a plan in place based on a past tragedy in 1971, the focus could have…