[bugfix] Fix listing of non-fixture-based dependencies

[teojgo]

No description provided.

[vkarak]

@teojgo Can you explain a bit what problem this PR solves?

[vkarak]

Perhaps we should add a small cli test that lists test with dependencies, e.g., ./bin/reframe -c unittests/resources/checks_unlisted/deps_complex.py -l

[teojgo]

@teojgo Can you explain a bit what problem this PR solves?

It fixes the problem where during listing, ReFrame tries to access fixture data even for non fixture tests.

[codecov-commenter]

Codecov Report

Base: 86.58% // Head: 86.75% // Increases project coverage by +0.17% 🎉

Coverage data is based on head (d9787b0) compared to base (facdd8b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2798      +/-   ##
==========================================
+ Coverage   86.58%   86.75%   +0.17%     
==========================================
  Files          60       60              
  Lines       11233    11237       +4     
==========================================
+ Hits         9726     9749      +23     
+ Misses       1507     1488      -19     

Impacted Files	Coverage Δ
reframe/frontend/cli.py	76.47% <100.00%> (+3.12%)	⬆️

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