[BUGFIX] ErrorHandler: Stop execution if E_RECOVERABLE_ERROR occurs

Ensure the ErrorHandler stops script execution if an error occurs.

Resolves: #61213
Releases: master, 6.2, 6.1
Change-Id: I0324a571b494576db1d314d8af0a86273e3205d3
Reviewed-on: http://review.typo3.org/33491
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>