[BUGFIX] Ignore invalid files in LocalDriver::getDirectoryItemList

Due to some security changes in GeneralUtility::validPathStr some
wrongly encoded files are now returned as invalid. This breaks e.g. the
file list.
This patch adds a try/catch block to ignore invalid files and return the
valid ones.

Resolves: #79776
Releases: master, 7.6, 6.2
Change-Id: Iaa3697b04c123bba61a426fdf39ee3959f68b705
Reviewed-on: https://review.typo3.org/51655


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Tobias Liebig <tobias.liebig@typo3.org>
Tested-by: Tobias Liebig <tobias.liebig@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Sascha Egerer <sascha@sascha-egerer.de>
Tested-by: Sascha Egerer <sascha@sascha-egerer.de>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>