When we have a previous manifest, we try to download the fidx/didx files
to get the known chunks list. We continue if that fails (which is ok),
but we did not print any error, leading to a confusing backup output,
since the users would expect that chunks will be reused.
Printing the error should at least make it apparent that something did
not work correctly.
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
7c22932c64