[BUGFIX] Check existence of properties before usage

The ImageViewHelper uses properties 'title' and 'alternative' from file
without checking whether they exist or not. This results in an
exception for example with freshly uploaded files.

Releases: master
Resolves: #88222
Change-Id: I2b251e5f885bd00119a958e6bc2275c7e672336f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60568


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Willi Wehmeier <wwwehmeier@gmail.com>
Reviewed-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>