Claus Due authored Mar 19, 2019 and Anja Leichsenring committed Jun 05, 2019

Prevents multiple division by zero errors when scaling
images, by checking that the input image size is valid
(meaning non-zero) before attempting to calculate
the ratio for scaling - because the ratio is based on the
input size parameters that must not be zero.

Change-Id: I33fd3e49a1b3dcdc319309af736a9d785130af94
Releases: master, 9.5, 8.7
Resolves: #87954
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60299

Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>