fix(raw_vehicle_cmd_converter): fix null check

[kosuke55]

Description

Fixed a problem where nodes die or topics stop when certain parameters are set.
related to: #8504

Related links

Parent Issue:

• Link

How was this PR tested?

ros2 launch tier4_vehicle_launch vehicle.launch.xml vehicle_model:=lexus sensor_model:=aip_xx1  launch_vehicle_interface:=true

ros2 bag  play 1feddd62-ce45-41ee-bed6-3dcdb06ccc8e_2024-08-29-14-23-07_p0900_1.db3 --topics /control/command/control_cmd /localization/kinematic_state /vehicle/status/steering_status /vehicle/status/actuation_status --clock 100

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 24.14%. Comparing base (fb6fd8d) to head (fe019ba).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...le/autoware_raw_vehicle_cmd_converter/src/node.cpp	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8677      +/-   ##
==========================================
- Coverage   24.14%   24.14%   -0.01%     
==========================================
  Files        1400     1401       +1     
  Lines      102278   102307      +29     
  Branches    38765    38768       +3     
==========================================
  Hits        24699    24699              
- Misses      75038    75067      +29     
  Partials     2541     2541              

Flag	Coverage Δ		*Carryforward flag
differential	4.58% <0.00%> (?)
total	24.14% <ø> (+<0.01%)	⬆️	Carriedforward from fb6fd8d

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