Some bug fixes and a docker container to simplify usage

[Mat198]

Bugs I found while I was trying this tool:

• Crash during package.xml convertion when an element had a None parent
• Missing python dependencies
• Missing file rviz_class_defaults.yaml wich was not installed

Docker to use the tool without having ROS 1 and other dependencies installed

[Mat198]

It seens that the build is failing due to this: https://discourse.ros.org/t/ros-signing-key-migration-guide/43937

Is it possible to update the test docker?

16:05:37  ---> Running in 8ca6a326b46c
16:05:37 2025-06-13 (-0800)
16:05:37 Removing intermediate container 8ca6a326b46c
16:05:37  ---> 4820faa1a8cb
16:05:37 Step 19/27 : RUN for i in 1 2 3; do apt-get update && apt-get install -q -y python3 && apt-get clean && break || if [ $i -lt 3 ]; then sleep 5; else false; fi; done
16:05:37  ---> Running in 43ce0c1158ab
16:05:37 Get:1 http://repositories.ros.org/ubuntu/testing focal InRelease [4,679 B]
16:05:37 Err:1 http://repositories.ros.org/ubuntu/testing focal InRelease
16:05:37   The following signatures were invalid: EXPKEYSIG F42ED6FBAB17C654 Open Robotics <info@osrfoundation.org>
16:05:37 Hit:2 http://security.ubuntu.com/ubuntu focal-security InRelease
16:05:38 Hit:3 http://archive.ubuntu.com/ubuntu focal InRelease
16:05:38 Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
16:05:38 Hit:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease
16:05:38 Reading package lists...
16:05:39 �[91mW: GPG error: http://repositories.ros.org/ubuntu/testing focal InRelease: The following signatures were invalid: EXPKEYSIG F42ED6FBAB17C654 Open Robotics <info@osrfoundation.org>
16:05:39 E: The repository 'http://repositories.ros.org/ubuntu/testing focal InRelease' is not signed.
16:05:39 �[0mGet:1 http://repositories.ros.org/ubuntu/testing focal InRelease [4,679 B]
16:05:44 Err:1 http://repositories.ros.org/ubuntu/testing focal InRelease
16:05:44   The following signatures were invalid: EXPKEYSIG F42ED6FBAB17C654 Open Robotics <info@osrfoundation.org>
16:05:44 Hit:2 http://security.ubuntu.com/ubuntu focal-security InRelease
16:05:44 Hit:3 http://archive.ubuntu.com/ubuntu focal InRelease
16:05:44 Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
16:05:45 Hit:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease
16:05:45 Reading package lists...
16:05:46 �[91mW: GPG error: http://repositories.ros.org/ubuntu/testing focal InRelease: The following signatures were invalid: EXPKEYSIG F42ED6FBAB17C654 Open Robotics <info@osrfoundation.org>
16:05:46 E: The repository 'http://repositories.ros.org/ubuntu/testing focal InRelease' is not signed.
16:05:46 �[0mGet:1 http://repositories.ros.org/ubuntu/testing focal InRelease [4,679 B]
16:05:51 Err:1 http://repositories.ros.org/ubuntu/testing focal InRelease
16:05:51   The following signatures were invalid: EXPKEYSIG F42ED6FBAB17C654 Open Robotics <info@osrfoundation.org>
16:05:51 Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
16:05:51 Hit:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease
16:05:51 Hit:4 http://security.ubuntu.com/ubuntu focal-security InRelease
16:05:51 Hit:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease
16:05:51 Reading package lists...
16:05:52 �[91mW: GPG error: http://repositories.ros.org/ubuntu/testing focal InRelease: The following signatures were invalid: EXPKEYSIG F42ED6FBAB17C654 Open Robotics <info@osrfoundation.org>
16:05:52 E: The repository 'http://repositories.ros.org/ubuntu/testing focal InRelease' is not signed.
16:05:52 �[0mRemoving intermediate container 43ce0c1158ab
16:05:52 The command '/bin/sh -c for i in 1 2 3; do apt-get update && apt-get install -q -y python3 && apt-get clean && break || if [ $i -lt 3 ]; then sleep 5; else false; fi; done' returned a non-zero code: 1
16:05:52 Build step 'Execute shell' marked build as failure
16:05:52 [CMakeGNU C Compiler (gcc)Clang-Tidy] Skipping execution of recorder since overall result is 'FAILURE'
16:05:52 INFO: Processing GoogleTest-1.8
16:05:52 INFO: [GoogleTest-1.8] - No test report file(s) were found with the pattern 'ws/test_results/**/*.xml' relative to '/home/jenkins-agent/workspace/Npr__roscompile__ubuntu_focal_amd64' for the testing framework 'GoogleTest-1.8'.
16:05:52 Did you enter a pattern relative to (and within) the workspace directory?
16:05:52 Did you generate the result report(s) for 'GoogleTest-1.8'?"
16:05:52 WARNING: All test reports are empty.
16:05:52 INFO: Check 'Failed Tests' threshold.
16:05:52 INFO: Check 'Skipped Tests' threshold.
16:05:52 INFO: Setting the build status to FAILURE
16:05:52 Setting status of 0d945499f1198564d56e329d6dc4e0a5a734e648 to FAILURE with url https://build.ros.org/job/Npr__roscompile__ubuntu_focal_amd64/30/ and message: 'Build finished. '
16:05:52 Using context: Npr__roscompile__ubuntu_focal_amd64
16:05:53 Finished: FAILURE```