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Description of problem:
When generating a report template that doesn't contain report_render string in template, the Output Format field is greyed out but contains the value of "CSV". This is misleading because the resulting file is a text file, according both to MIME type and to its extension.

Version-Release number of selected component (if applicable):
6.7, feature unavailable in previous versions

How reproducible:
Deterministic

Steps to Reproduce:
1. Create a report template that doesn't contain report_render string in template
2. Monitor -> Report Templates -> Generate

Actual results:
Output Format field greyed out, containing "CSV"

Expected results:
Something that is not misleading, e.g. empty value

Created redmine issue https://projects.theforeman.org/issues/28845 from this bug

Moving this bug to POST for triage into Satellite 6 since the upstream issue https://projects.theforeman.org/issues/28845 has been resolved.

Verified with Sat 6.8 snap 3.0.

Used reproducer from OP. Custom reports now have the Output Format field greyed out and empty (and the result is a txt file) while the behavior hasn't changed when generating built-in reports.

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 (Important: Satellite 6.8 release), 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-2020:4366