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rqt_graph may not show sources or sinks that aren't connected, if you have that option disabled.
From the documentation it looks like the pointcloud_to_laserscan_node takes it input on the cloud_in
topic, so you should remap that to the pointcloud output topic from your velodyne.
rosrun pointcloud_to_laserscan pointcloud_to_laserscan_node cloud_in:=/your_velodyne_points
(replace /your_velodyne_points
with the pointcloud topic from your velodyne)