[stable22] Fix #20913: Check image resource before attempting to preserve alpha #28499
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![backportbot-nextcloud[bot]](https://web.archive.org/web/20220506112426im_/https://avatars.githubusercontent.com/in/21012?s=60&v=4){kind=small}
Signed-off-by: Simon Spannagel <simonspa@kth.se>
backportbot-nextcloud
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skjnldsv
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Aug 19, 2021
skjnldsv
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backport of #28485