[BUG] null is appearing as a label after sync code

[apupier]

Describe the bug

fullUseCaseRepoduicingNull.mp4

To Reproduce
Steps to reproduce the behavior:

1. Create a Camel Route
2. Add a "Rest API" endpoint to start the route
3. In path, provide /test
4. Click "create new Endpoint"
5. Click "Generate 1 Endpoints"
6. Open Source code editor
7. Click on Sync code
   --> the label "null" appears on one transition

Expected behavior
A clear and concise description of what you expected to happen.

Logs
If applicable, add logs to help explain your problem.

Environment (please complete the following information):

• OS: [e.g. "Linux 5.10.0-9-amd64 Using sonarcloud action to add details on PR #1 SMP Debian 5.10.70-1 (2021-09-30) x86_64 GNU/Linux"]
• Output of the mvn -version` command
• Kaoto Version

Additional context

in fact, it sounds even that the path parameter is lost and replaced by null

[lordrip]

This issue will be handled as part of the new Rest DSL visualization. Created KaotoIO/kaoto-ui#2104 for tracking it