Description of problem:
When trying to show non-existent setting via hammer or API using it's id, we get
"undefined method" error.

Version-Release number of selected component (if applicable):
6.13.5, 6.14.0, 6.15.0 stream

How reproducible:
always

Steps to Reproduce:
1. On SAT try: hammer settings info --id wrong_id
2. On SAT try: curl -su admin:changeme https://$(hostname)/api/settings/wrong_id

Actual results:
1. undefined method `name' for nil:NilClass
2.
{
"error":

}

Expected results:
Error: setting not found.

QE Tracker for https://issues.redhat.com/browse/SAT-20238