fix: fix bug in euclidean_cluster

Signed-off-by: kminoda <koji.minoda@tier4.jp>

Author: kminoda

perception/euclidean_cluster/src/voxel_grid_based_euclidean_cluster_node.cpp

@@ -76,10 +76,7 @@ void VoxelGridBasedEuclideanClusterNode::onPointCloud(
   cluster_pub_->publish(output);
 
   // build debug msg
-  if (debug_pub_->get_subscription_count() < 1) {
-    return;
-  }
-  {
+  if (debug_pub_->get_subscription_count() <= 1) {
     sensor_msgs::msg::PointCloud2 debug;
     convertObjectMsg2SensorMsg(output, debug);
     debug_pub_->publish(debug);