[stable20] Set frame-ancestors to none if none are filled #24477
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backportbot-nextcloud
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ChristophWurst,
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rullzer
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ChristophWurst
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ChristophWurst
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frame-ancestors doesn't fall back to default-src. So when we apply a very restricted CSP we should make sure to set it to 'none' and not leave it empty. Signed-off-by: Roeland Jago Douma <[email protected]>
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backport of #24189