CompositeValidator has wrong status

[sideisra]

When a CompositeValidator has two other validators which return a similar message when they are invalid, the validation status of the CompositeValidator is true but should be false.

Unittest to reproduce the bug:

@Test
public void test() {
    final StringProperty prop1 = new SimpleStringProperty();
    final StringProperty prop2 = new SimpleStringProperty();
    final Validator notEmpty1 = new FunctionBasedValidator<>(prop1, v -> {
        if (Strings.isNullOrEmpty(v)) {
            return ValidationMessage.error("msg");
        }
        return null;
    });
    final Validator notEmpty2 = new FunctionBasedValidator<>(prop2, v -> {
        if (Strings.isNullOrEmpty(v)) {
            return ValidationMessage.error("msg");
        }
        return null;
    });
    final CompositeValidator compositeValidator = new CompositeValidator(notEmpty1, notEmpty2);
    prop1.set("");
    prop2.set("");
    prop1.set("a");
    assertThat(notEmpty1.getValidationStatus().isValid()).isTrue();
    assertThat(notEmpty2.getValidationStatus().isValid()).isFalse();
    assertThat(compositeValidator.getValidationStatus().isValid()).isFalse();
}

[manuel-mauky]

I can reproduce this issue. I will take a deeper look into this tomorrow