David Muir is as steadfast as can be when it comes to his journalistic work, and fans could see it with his latest post as they were rendered emotional.MORE: GMA star David Muir spent years restoring $7million lakeside home - insideThe Good Morning America anchor shared a photograph from his reporting in Kentucky, which had been ravaged by a tornado that left several dead and even more missing.In the picture, he stood in front of a building that had been torn apart by the winds as he readied