Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1727928

Description of problem:
When I don't select errata type while generating the Applied Errata report, it produces empty output. Not even header is in the resulting file.

Version-Release number of selected component (if applicable):
Reproduced on Sat 6.6 snap 10.

How reproducible:
Deterministic

Steps to Reproduce:
1. Have a Satellite, a content host fully registered to it (bootstrap, katello-agent)
2. Have some erratum applicable to that content host
3. Go to the content host page -> Errata
4. Select some erratum
5. Click "Apply Selected"
6. Monitor -> Report Templates
7. Generate "Applicable Errata"
8. Default values, Submit

Actual results:
Empty file

Expected results:
File with at least a header and an entry for the applied erratum. I think not filling the field should be interpreted as "all".

Additional information:
Tested with errata applied through katello-agent because I'm blocked on testing with remote execution due to bug 1727927.