@Override
        public NestedBean16 getNestedBean() {
            return nestedBean16;
        }
Test that propagateNull is bubbled up. If the property in the nested bean is null, not only null out the nested bean but the prent bean as well. Do not
actually set a prefix for the nested bean, so the properties are picked up without a prefix.
core/src/test/java/org/jdbi/v3/core/mapper/PropagateNullTest.java