private static String getNamedTopologyOrElseNull(final String namedTopology) {
        return (namedTopology == null || namedTopology.length() == 0) ?
                null :
                namedTopology;
    }
@return the namedTopology name, or null if the passed in namedTopology is null or the empty string
streams/src/main/java/org/apache/kafka/streams/processor/internals/assignment/ConsumerProtocolUtils.java