fix(pointcloud_preprocessor): empty pointcloud bug

[0x126]

Related Issue(required)

Description(required)

• Fixed a bug that caused some modules to crash when the input point cloud was empty.

Review Procedure(required)

• Play rosbags and check pointclouds and rosout

Related PR(optional)

#253

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[codecov]

Codecov Report

Merging #373 (b1d74aa) into tier4/proposal (eb599ae) will decrease coverage by 9.32%.
The diff coverage is 0.00%.

@@                Coverage Diff                @@
##           tier4/proposal    #373      +/-   ##
=================================================
- Coverage            9.32%   0.00%   -9.33%     
=================================================
  Files                 701      42     -659     
  Lines               48973    2815   -46158     
  Branches             5818       0    -5818     
=================================================
- Hits                 4566       0    -4566     
+ Misses              40594    2815   -37779     
+ Partials             3813       0    -3813     

Impacted Files	Coverage Δ
.../src/concatenate_data/concatenate_data_nodelet.cpp	0.00% <0.00%> (ø)
...lier_filter/dual_return_outlier_filter_nodelet.cpp	0.00% <0.00%> (ø)
...lization/src/traffic_light_map_visualizer/main.cpp
...ng_simulator/vehicle_model/sim_model_interface.cpp
...anner/include/scene_module/traffic_light/scene.hpp
...c/tracker/model/pedestrian_and_bicycle_tracker.cpp
map/lanelet2_extension/lib/detection_area.cpp
...tem/system_monitor/src/mem_monitor/mem_monitor.cpp
...test/src/test_planning_error_monitor_functions.cpp
... and 652 more

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[1222-takeshi]

LGTM

[1222-takeshi]

@0x126
Could you write release note?

[kenji-miyake]

@1222-takeshi Since the release notes are for TIER IV, we'll manage them in sync PRs in tier4 org like this: tier4#11