[BUGFIX] Let Scheduler handle storage indexing exception

The FileStorageIndexingTask should not handle exceptions itself.
Instead it should let them bubble up to let the Scheduler take
care of the reporting.

Resolves: #65248
Releases: 6.2, master
Change-Id: Ib29c20b40de8abd27869682c9f6d4479718d25f5
Reviewed-on: http://review.typo3.org/37156


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>