Description

The tool moveit_publish_scene_from_text does not work without providing --scene and hence cannot publish on topic /planning_scene_world.

Origin of the Problem

The --scene flag changes the topic of where the scene is published on. This is controlled by full_scene in the code:
https://github.com/ros-planning/moveit2/blob/c686bb8dc312029430d6c353799ef462d05bb3e7/moveit_ros/planning/planning_components_tools/src/publish_scene_from_text.cpp#L62-L67
and then sets the topic:
https://github.com/ros-planning/moveit2/blob/c686bb8dc312029430d6c353799ef462d05bb3e7/moveit_ros/planning/planning_components_tools/src/publish_scene_from_text.cpp#L77-L86

The topic is either /planning_scene (with --scene) or /planning_scene_world (without --scene).

However, when the node waits here:
https://github.com/ros-planning/moveit2/blob/c686bb8dc312029430d6c353799ef462d05bb3e7/moveit_ros/planning/planning_components_tools/src/publish_scene_from_text.cpp#L103-L105
it only considers the option for the pub_scene topic which is only defined when --scene is set.

Removing the last "waiting" part fixes the issue and successfully publishes the "world" on /planning_scene_world.

Steps to reproduce

Terminal 1 (publish scene):

ros2 run moveit_ros_planning moveit_publish_scene_from_text ${scene_file} --ros-args -p robot_description:="${urdf}" -p robot_description_semantic:="${srdf}"

Terminal 2 (monitor scene):

ros2 topic echo /planning_scene_world

Expected behaviour

The scene message should be published on topic /planning_scene_world.

Actual behaviour

No messages arrive.