@Override
    public String toString() {
        return "Assignment{" +
                "error=" + error() +
                ", leader='" + leader() + '\'' +
                ", leaderUrl='" + leaderUrl() + '\'' +
                ", offset=" + offset() +
                ", connectorIds=" + connectors() +
                ", taskIds=" + tasks() +
                ", revokedConnectorIds=" + revokedConnectorIds +
                ", revokedTaskIds=" + revokedTaskIds +
                ", delay=" + delay +
                '}';
    }
Return an empty assignment.

@return an empty assignment
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/ExtendedAssignment.java