If we don't find previews in the filecache, this is now normal. Don't
abort and instead delete previews from the new preview table instead.
Signed-off-by: Carl Schwan <carlschwan@kde.org>
When changing preview parameters (size, format, …), one can simply delete the preview folder and run
files:scan-app-data in order to retrigger updated preview recreation because files are absent.
However, that's not possible when using ObjectStorage as primary storage, as there's no concept of
"preview folder".
This command allows to simply delete and recreate the preview folder properly from
Nextcloud, so that the abstraction levels handle all the subfolder & file deleting part.
Signed-off-by: Thomas Citharel <tcit@tcit.fr>
