Reports fail to be generated because xUnit cant (I dont know why) create generatedJUnitFiles/ - manually creating the folder allows it to proceed. I dont know if this is related to PHPUnit 3.5, but in any case xUnit might need to be updated for PHPUnit 3.5 as it currently support 3.4 only.

Error report below:
[xUnit] Starting to record.
[xUnit] Can't create the path /var/lib/hudson/jobs/Zikula-1.3.0/workspace/generatedJUnitFiles. Maybe the directory already exists.
[xUnit] [PHPUnit-3.4 (default)] - Processing 1 files with the pattern 'build/logs/phpunit.xml' relative to '/var/lib/hudson/jobs/Zikula-1.3.0/workspace'.
[xUnit] [INFO] - Converting '/var/lib/hudson/jobs/Zikula-1.3.0/workspace/build/logs/phpunit.xml' .
[xUnit] Stopping recording.