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Description of problem:
Hammer content view version export fails with the below error. 

[root@satellite]# hammer content-view version export --export-dir /var/export --id 2
tar: Cowardly refusing to create an empty archive
Try `tar --help' or `tar --usage' for more information.

Version-Release number of selected component (if applicable):
Satellite 6.5

It fails when there is no repository added in the content-view, One of the customer has published the content without any repository and was trying to export it. 

Actual results:
tar: Cowardly refusing to create an empty archive
Try `tar --help' or `tar --usage' for more information.

Expected results:
Should report that there is no repository added in the content view

Moving this bug to POST for triage into Satellite 6 since the upstream issue https://projects.theforeman.org/issues/27039 has been resolved.

Checked on Satellite 6.6 snap 11. Using code from comment#0 with no repository added in the content-view, ended with report:
Could not export the content view:
  Error: Ensure the content view version 'example' has at least one repository.

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-2019:3172