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Description of problem:

Calling katello-restore without arguments:

# katello-restore 
/usr/bin/katello-restore:20:in `dup': can't dup NilClass (TypeError)
	from /usr/bin/katello-restore:20:in `<main>'


Expected results:

katello-restore should either display a message instructing user to specify the restore directory or just display the help output:

]# katello-restore
Usage: katello-restore /path/to/dir [options]
 eg: $ katello-restore /tmp/backup/katello-backup-2016-09-30T00:00:00+00:00
    -y, --assumeyes                  Answer yes for all questions

Created redmine issue http://projects.theforeman.org/issues/19622 from this bug

Moving this bug to POST for triage into Satellite 6 since the upstream issue http://projects.theforeman.org/issues/19622 has been resolved.

Moving this bug to POST for triage into Satellite 6 since the upstream issue http://projects.theforeman.org/issues/19622 has been resolved.

Verified on Satellite 6.3 snap 11

~]# katello-restore
katello-restore: **** ERROR: Please specify the backup directory to restore ****

Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA.
> 
> For information on the advisory, and where to find the updated files, follow the link below.
> 
> If the solution does not work for you, open a new bug report.
> 
> https://access.redhat.com/errata/RHSA-2018:0336