[BUGFIX] Avoid warning caused by missing array key noScale

This fix avoids the warning which can occur, because the array key
noScale is missing during the rendering of an image.

Resolves: #62961
Releases: master, 6.2
Change-Id: I1ed5c97570173ad29992eb2fdcbf04f8c094ec9d
Reviewed-on: http://review.typo3.org/34197
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>