Remove nulls for Map instance in ServiceDefinition.nestedRemoveNullsFromResultMap()

Should we remove nulls for Map in ServiceDefinition.nestedRemoveNullsFromResultMap()?

For example, add lines below in ServiceDefinition.java line 829

       _else if (value instanceof Map) {
            entry.setValue(CollectionUtilities.removeNullsFromMap((Map)value));
        }_