Error in Jython when creating a PyList with Py.None

errorPyNone

		Object[][] JavaArray = new Object[2][3];
		JavaArray[0][0] = 1;
		JavaArray[0][1] = null;
		JavaArray[0][2] = 2;
		JavaArray[1][0] = 1;
		JavaArray[1][1] = null;
		JavaArray[1][2] = 2;
		
				for(int rows = 0; rows<JavaArray.length;rows++){
			//System.out.println(String.valueOf(rows));
			Object[] currow = JavaArray[rows];
			PyList Jyrow = new PyList();
			
			for (int cols = 0; cols<currow.length;cols++){
				System.out.println(String.valueOf(rows) + " " + String.valueOf(cols));
				if (currow[cols] != null){
				    Jyrow.append(new PyFloat((Integer)currow[cols]));
				}
				else{
					Jyrow.append(Py.None);
				}
			}
			JythonList.append(Jyrow);
		}
		
		System.out.println(JythonList.toString());