John Garfield,  Geraldine Fitzgerald and Walter Brennan in ‘Nobody Lives Forever’ (1946). By Paul Parcellin As conmen go, Nick Blake (John Garfield) is more likeable than your average grifter. A bit out of practice, he’s ready to get back into the flim-flam game. But first, he’s got a score to settle. In “Nobody Lives Forever” (1946),…