[BUGFIX] Suppress EXIF warnings indexing images

FileContentParser used to issue a warning trying to index image
files with corrupted EXIF data. Suppress these warnings to fail
silently.

Resolves: #55286
Releases: 6.2, 6.1
Change-Id: I863601f5579ab74a0743ab684cf1d898b633edba
Reviewed-on: https://review.typo3.org/27715
Reviewed-by: Markus Klein
Tested-by: Markus Klein