[Debug] ensured that a fatal PHP error is actually fatal after being handled by our error handler
bug #9648 [Debug] ensured that a fatal PHP error is actually fatal after being handled by our error handler (fabpot)

This PR was merged into the 2.3 branch.

Discussion
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[Debug] ensured that a fatal PHP error is actually fatal after being handled by our error handler

This is a follow-up for #9641 where I try to restore the previous code behavior as much as possible.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Commits
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d7a4cfb [Debug] ensured that a fatal PHP error is actually fatal after being handled by our error handler