Brian Steinberg Senior TV EditorExecutives at NBCUniversal, NBC News and the NBC broadcast network are not-so-quietly thanking an employee who has only limited command over the Comcast-owned company’s corporate direction: Savannah Guthrie.Guthrie’s handling of President Donald Trump during a town-hall broadcast organized in last-minute fashion by NBC News helped blunt waves of criticism of the media conglomerate, which scheduled the event directly opposite one with Joe Biden, Trump’s Democratic