Fixes #15313: Policy generation error is not clear in log anymore

[fanf]

https://issues.rudder.io/issues/15313

[Normation-Quality-Assistant]

This PR breaks qa-test

-- stdout -- 
Branch 'master' set up to track remote branch 'master' from 'NRM'.
Your branch is up to date with 'NRM/master'.
Already up to date.
Already up to date.
[...]

-- stderr --
From github.com:fanf/rudder
 * [new branch]          bug_15313/policy_generation_error_is_not_clear_in_log_anymore -> bug_15313/policy_generation_error_is_not_clear_in_log_anymore_pr
Switched to branch 'master'
Switched to a new branch 'master_test'
+ '[' --merge = --rust ']'
+ '[' --merge = --scala ']'
+ webapp/sources/rudder/rudder-core/src/test/resources/hooks.d/test-hooks.sh

You should run ./qa-test in your repository to make sure it works.
You can also run rudder-dev merge https://github.com/Normation/rudder/pull/2344 --test to test with upmerging.
After this, you can remove the qa: Can't merge ta
-- Your faithful QA (https://ci.normation.com/jenkins/job/merge-accepted-pr/12840/console)

[fanf]

PR updated with a new commit

[Normation-Quality-Assistant]

This PR is not mergeable to upper versions.
Since it is "Ready for merge" you must merge it by yourself using the following command:
rudder-dev merge https://github.com/Normation/rudder/pull/2344
-- Your faithful QA
Kant merge: "Happiness is not an ideal of reason, but of imagination."
(https://ci.normation.com/jenkins/job/merge-accepted-pr/12842/console)

[Normation-Quality-Assistant]

This PR is not mergeable to upper versions.
Since it is "Ready for merge" you must merge it by yourself using the following command:
rudder-dev merge https://github.com/Normation/rudder/pull/2344
-- Your faithful QA
Kant merge: "Morality is not the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness."
(https://ci.normation.com/jenkins/job/merge-accepted-pr/12843/console)

[fanf]

OK, squash merging this PR