Donald Trump’s attorneys in his Manhattan hush money trial are about to walk through a legal minefield as they cross examine a uniquely challenging witness, according to the former president’s onetime lawyer. Trump’s former impeachment defense lawyer Robert Ray appeared on CNN Tuesday to issue a stern warning on how to handle the questioning of Keith Davidson, the former attorney for adult film star Stormy Daniels and Playboy model Karen McDougal. Anchor Erin Burnett prompted the discussion by noting Davidson was not eager to testify. “[Davidson’s] not thrilled to be there, but he knows what h…