[BUGFIX] Avoid calculating crop areas, when files have no size

When file relations are added, the crop area of these is calculated,
even if they are not images.

We avoid that by only doing this processing, when the file
has a width property.

Resolves: #80071
Releases: master
Change-Id: I42924b271e5a6697d35ffb7d5f322f555139ec57
Reviewed-on: https://review.typo3.org/52192


Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Tested-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>