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ba690c40 ("file-restore: remove 'json-error' parameter from list_files")
in proxmox-backup, the file-restore binary will return the error as json
when called with '--output-format json' (which we do in PVE::PBSClient)
here, we assume that 'file-restore' will fail in that case, and we try
to use the return value as an array ref which fails, and the user never
sees the real error message.
To fix that, check the ref type of the return value and act accordingly
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>