Fix confusing error message when CLI is used with a class that defines a subcommand method

[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)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c5999b1) 100.00% compared to head (4ea9922) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #444   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines         5970      5973    +3     
=========================================
+ Hits          5970      5973    +3     

Flag	Coverage Δ
py3.10	88.33% <100.00%> (+<0.01%)	⬆️
py3.10_all	98.72% <100.00%> (+<0.01%)	⬆️
py3.10_pydantic1	48.38% <0.00%> (-0.03%)	⬇️
py3.10_pydantic2	48.11% <0.00%> (-0.03%)	⬇️
py3.10_types	98.72% <100.00%> (+<0.01%)	⬆️
py3.11	88.31% <100.00%> (+<0.01%)	⬆️
py3.11_all	98.72% <100.00%> (+<0.01%)	⬆️
py3.11_types	98.72% <100.00%> (+<0.01%)	⬆️
py3.12	88.31% <100.00%> (+<0.01%)	⬆️
py3.12_all	98.72% <100.00%> (+<0.01%)	⬆️
py3.12_types	98.72% <100.00%> (+<0.01%)	⬆️
py3.7	88.90% <100.00%> (+<0.01%)	⬆️
py3.7_all	99.49% <100.00%> (+<0.01%)	⬆️
py3.7_types	99.47% <100.00%> (+<0.01%)	⬆️
py3.8	89.05% <100.00%> (+<0.01%)	⬆️
py3.8_all	99.51% <100.00%> (+<0.01%)	⬆️
py3.8_types	99.49% <100.00%> (+<0.01%)	⬆️
py3.9	88.90% <100.00%> (+<0.01%)	⬆️
py3.9_all	99.38% <100.00%> (+<0.01%)	⬆️
py3.9_types	99.38% <100.00%> (+<0.01%)	⬆️

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[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud