The Emmy Award-winning "CBS News Sunday Morning" is broadcast on CBS Sundays beginning at 9:00 a.m. ET.  "Sunday Morning" also  streams on the CBS News app  beginning at 11:00 a.m. ET. ( Download it here .)  Hosted by Jane Pauley      COVER STORY: Rescuing Marc Chagall from the Nazis Yad Vashem, Israel's official memorial to the victims of the Holocaust, has a name for those who risked their own lives to save others: The Righteous Among the Nations. One American who received that distinction