uxrce_dds_client - Fix nullptr access in certain cleanup situations #23913
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Solved Problem
When the uxrce_dds_client is not able to connect it cleans up the current session and retries the connection after a certain time. This works well in most cases, but in certain situations the connection fails even before a session is created. This will cause a nullptr access when trying to clean a session that is not yet created.
Solution
Only clean the session if it has been created.
Changelog Entry
For release notes:
Test coverage