Gianluigi Assenato, an Italian fashion designer who pleaded guilty to stalking “NYPD Blue” actress Andrea Thompson after their six-month romance soured, to two years in prison to be followed by deportation, by a Los Angeles judge on Monday. Assenato, 34, began dating Thompson, 38, after making her a dress for the Emmys. Prosecutors say he slashed Thompson’s tires and made threats against her and her child.