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Description of problem:
When creating a template with 2 inputs with the same name, the error "uninitialized constant #<Class:0x000000000b894c38>::NonUniqueInputsError" appears and the operation fails. No traceback in production.log. Failure is expected but it should be handled better: the message should be more user friendly and preferably, the check should be handled before submitting the form.

Version-Release number of selected component (if applicable):
Reproduced on Sat 6.6 snap 22.

How reproducible:
Deterministic

Steps to Reproduce:
1. Monitor -> Report Templates -> Create
2. Set name
3. Go to Inputs tab
4. Add input, name it "abc"
5. Add another input, name it "abc"
6. Submit

Actual results:
Error, operation failed

Expected results:
(Form not submittable because this is checked by Javascript before submission). Better error message.

Created redmine issue https://projects.theforeman.org/issues/28995 from this bug

Upstream bug assigned to mshira

Upstream bug assigned to mshira

Moving this bug to POST for triage into Satellite 6 since the upstream issue https://projects.theforeman.org/issues/28995 has been resolved.

Verified with Sat 6.8 snap 3.0.

Using reproducer from OP, after submitting, I get:
```
Unable to save
ERF42-3514 [Foreman::Exception]: Duplicated inputs detected: ["abc"]
```

Using Hammer, I get (no change here):
```
Could not create the template input:
  Name has already been taken
```

Adding different-named inputs works.

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