Fix key related errors printing messages within single quotes

[mauvilsa]

Before submitting

• Did you read the contributing guideline?
• [n/a] Did you update the documentation? (readme and public docstrings)
• Did you write unit tests such that there is 100% coverage on related code? (required for bug fixes and new features)
• Did you verify that new and existing tests pass locally?
• Did you make sure that all changes preserve backward compatibility?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8f5bcda) 100.00% compared to head (6a13b24) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #401   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines         5843      5846    +3     
=========================================
+ Hits          5843      5846    +3     

Flag	Coverage Δ
py3.10	88.09% <100.00%> (+<0.01%)	⬆️
py3.10_all	98.69% <100.00%> (+<0.01%)	⬆️
py3.10_pydantic1	48.46% <50.00%> (+0.02%)	⬆️
py3.10_pydantic2	48.18% <50.00%> (+0.02%)	⬆️
py3.10_types	98.69% <100.00%> (+<0.01%)	⬆️
py3.11	88.07% <100.00%> (+<0.01%)	⬆️
py3.11_all	98.69% <100.00%> (+<0.01%)	⬆️
py3.11_types	98.69% <100.00%> (+<0.01%)	⬆️
py3.7	88.67% <100.00%> (+<0.01%)	⬆️
py3.7_all	99.48% <100.00%> (+<0.01%)	⬆️
py3.7_types	99.46% <100.00%> (+<0.01%)	⬆️
py3.8	88.82% <100.00%> (+<0.01%)	⬆️
py3.8_all	99.50% <100.00%> (+<0.01%)	⬆️
py3.8_types	99.48% <100.00%> (+<0.01%)	⬆️
py3.9	88.67% <100.00%> (+<0.01%)	⬆️
py3.9_all	99.36% <100.00%> (+<0.01%)	⬆️
py3.9_types	99.36% <100.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
jsonargparse/_actions.py	100.00% <100.00%> (ø)
jsonargparse/_core.py	100.00% <100.00%> (ø)
jsonargparse/_namespace.py	100.00% <100.00%> (ø)

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