[BUGFIX] Handle array access in LocalImageProcessor

Handle missing image dimensions (width, height)
without throwing an exception.

In same cases, image dimension may not be able to be
set properly.

Resolves: #99406
Releases: main, 11.5
Change-Id: I81124dcaf29932448a87b69ab5bf6445eeb7469c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77757


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>