Improve handling of missing responses.json

[jonathan-eq]

Issue
Resolves #my_issue

Approach
Short description of the approach

(Screenshot of new behavior in GUI if applicable)

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codspeed-hq]

CodSpeed Performance Report

Merging #9589 will not alter performance

_{Comparing jonathan-eq:fix-missing_responses_error (5553bdc) with main (1889e2a)}

Summary

✅ 24 untouched benchmarks

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 91.83%. Comparing base (01156bb) to head (869f845).
Report is 20 commits behind head on main.

Files with missing lines	Patch %	Lines
.../ert/gui/tools/manage_experiments/storage_model.py	77.77%	6 Missing ⚠️
src/ert/gui/ertwidgets/ensembleselector.py	66.66%	4 Missing ⚠️
src/ert/storage/local_experiment.py	82.35%	3 Missing ⚠️
src/ert/storage/local_ensemble.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9589      +/-   ##
==========================================
- Coverage   91.85%   91.83%   -0.03%     
==========================================
  Files         433      433              
  Lines       26768    26879     +111     
==========================================
+ Hits        24587    24683      +96     
- Misses       2181     2196      +15     

Flag	Coverage Δ
cli-tests	39.69% <22.66%> (-0.07%)	⬇️
everest-models-test	34.55% <18.66%> (-0.04%)	⬇️
gui-tests	72.13% <77.33%> (+0.02%)	⬆️
integration-test	38.71% <22.66%> (+1.51%)	⬆️
performance-tests	51.88% <36.00%> (-0.06%)	⬇️
test	40.02% <22.66%> (-0.43%)	⬇️
unit-tests	74.06% <48.00%> (-0.11%)	⬇️

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