Fix get_planning_pipeline_id in Python MGI

[felixvd]

Fixes #2752 , which was introduced with the new feature in #2622. I should have made get_planning_pipeline_id without an argument.

It also adds some debugging prints, which should be helpful.

[codecov]

Codecov Report

Merging #2753 (a0c6702) into master (f72930c) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2753      +/-   ##
==========================================
- Coverage   60.47%   60.44%   -0.03%     
==========================================
  Files         402      404       +2     
  Lines       29660    29670      +10     
==========================================
- Hits        17933    17930       -3     
- Misses      11727    11740      +13     

Impacted Files	Coverage Δ
.../ompl_interface/src/detail/constrained_sampler.cpp	43.25% <0.00%> (-16.21%)	⬇️
...sion_detection_bullet/src/collision_env_bullet.cpp	78.75% <0.00%> (-0.99%)	⬇️
...meterization/work_space/pose_model_state_space.cpp	82.70% <0.00%> (-0.64%)	⬇️
..._detection/src/allvalid/collision_env_allvalid.cpp	9.31% <0.00%> (-0.45%)	⬇️
...raint_samplers/src/default_constraint_samplers.cpp	82.59% <0.00%> (-0.32%)	⬇️
...istance_field/src/collision_env_distance_field.cpp	63.27% <0.00%> (-0.16%)	⬇️
...ene/include/moveit/planning_scene/planning_scene.h	53.13% <0.00%> (ø)
...e/include/moveit/kinematics_base/kinematics_base.h	74.08% <0.00%> (ø)
...collision_detection/collision_detector_allocator.h	100.00% <0.00%> (ø)
...ield/collision_detector_allocator_distance_field.h	0.00% <0.00%> (ø)
... and 4 more

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[v4hn]

dumb bug indeed...