Margaret Fingerhut sat down to the piano with the determined air of a woman with a mission, which was echoed by the title of the record she was about to release: Ukraine: A Piano Portrait. As she had explained to Radio 3’s In Tune the night before, she cherishes the fact that her grandfather was born in Odesa, “and who would not be proud of being connected to the incredible musical heritage of Jews from that city?”Quite so. Think of the great vi…