[REGRESSION] New property model makes list properties return null values instead of empty list

The new following test won't pass in TestModel.testScalarList() :

ArrayList<String> emptyList = arrayList();
dp.get("references").init(emptyList);

prop = dp.get("references");
prop.setValue(emptyList);

assertEquals(emptyList, prop.getValue(List.class));
assertEquals(emptyList, prop.getValue());