[BUGFIX] #4696 Unit test crash about e-mail and caches in TYPO3 CMS 6.2

Change-Id: I6d197f21738d406d6636290cafdd225ce5afa7ea
Reviewed-on: http://review.typo3.org/34563
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>