Modify xbcloud to return the error when the backup doesn't exist in s3 bucket

Hi,

We have some interesting behaviour of 'xbcloud'. When we have valid credentials for AWS and try to get the file from backup which does not exist xbcloud returns the following massage with exit code '0'. Is it correct?

[root@239a0b699ea0]# xbcloud get s3://operator-testing/XXXXXX xtrabackup_info
200429 11:51:56 xbcloud: Successfully connected.
200429 11:51:56 xbcloud: Download completed.

[root@239a0b699ea]# echo $?
0

STR:
1) use the following version:
xbcloud Ver 8.0.11 for Linux (x86_64)

2) add valid credentials:
export AWS_SECRET_ACCESS_KEY='****************'
export AWS_ACCESS_KEY_ID='********************'

3) run the following command:
xbcloud get s3://operator-testing/XXXXXX xtrabackup_info

The debug log is in attachment.