0 fix sentry issues
Description
Fix some issues reported on Sentry :
- Classic "Navigation action/destination cannot be found" issue : https://murena-sas.sentry.io/issues/6016060601/?project=4504355889938432&query=level%3Afatal&referrer=issue-stream&statsPeriod=90d&stream_index=6
- Stop reporting error caused by unavailable connectivity while updating tracker list
- Customise message when user had a legacy VPN (IPSec configured in system settings), and tries to use IPScrambling