How to check if some List contains only one particular element OR is empty using AssertJ

I have:

@Test
public void testSomethingInFooFunction() {
    //given
    Something parameter = new Something();
    //when
    List<Object> result = foo(parameter);
    //then

    // not working
    assertThat(result).isEmpty().or().contains(something());
    assertThat(result).or(v -> v.isEmpty() || v.contains(something());

    //is working
    assertThat(modifiedPDs.isEmpty() || (
        modifiedPDs.contains(something())
        && modifiedPDs.size() == 1)
    ).isTrue();

}

Is there any other way to test condition like:

result.isEmpty() || ( result.contains(something()) && result.size() == 1)

Q: How to simplify it with AssertJ 3.11.1 ?