The YAML test files do not raise error when the corresponding scenario file is absent

[xmkg]

When the test with the name ".../tests/scenarios/openstack/keystone/foo.yaml" exists, but the scenario ".../scenarios/openstack/keystone/foo.yaml" is absent, the test proceeds to evaluate the conditions anyway. This is the same with the explicitly specified target-name property as well:

lp1896125-17-0-1.yaml

target-name: lp1896125-no-such-file.yaml
data-root:
  files:
    sos_commands/dpkg/dpkg_-l: |
      ii  keystone 2:17.0.1-0ubuntu0.20.04.1 amd64
    var/log/keystone/keystone.log: |
      Traceback (most recent call last):
          File "/usr/lib/python3.10/contextlib.py", line 135, in __enter__
            return next(self.gen)
          File "/usr/lib/python3/dist-packages/ldappool/__init__.py", line 391, in connection
            raise MaxConnectionReachedError(self.uri)
      ldappool.MaxConnectionReachedError: ldaps://ldapserver.example.com
raised-bugs:
  # none

Test results:

scenario/lp1896125-rework 16:23 > tox -e py3 -- lp1896125-17-0-1

{0} tests.unit.test_openstack.TestOpenstackScenarios.test_keystone_bugs_lp1896125-17-0-1 [0.005862s] ... ok

======
Totals
======
Ran: 1 tests in 0.0059 sec.
 - Passed: 1
 - Skipped: 0
 - Expected Fail: 0
 - Unexpected Success: 0
 - Failed: 0
Sum of execute time for each test: 0.0059 sec.

==============
Worker Balance
==============
 - Worker 0 (1 tests) => 0:00:00.005862
  py3: OK (0.85=setup[0.02]+cmd[0.83] seconds)
  congratulations :) (0.88 seconds)