private static boolean topicNameIsUnrepresentable(String topicName) {
        return topicName == null || topicName.isEmpty();
    }
Returns true if a topic name cannot be represented in an RPC.  This function does NOT check
whether the name is too long, contains invalid characters, etc.  It is better to enforce
those policies on the server, so that they can be changed in the future if needed.
clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java