fix: empty tuples are correctly parsed

[MiguelMonteiro]

What does this PR do?

Empty tuples are now successfully parsed.

Fixes #589

Before submitting

• Did you read the contributing guideline?
• 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)

[mauvilsa]

Also please add a changelog entry in a new section as explained in the contributions guide.

[MiguelMonteiro]

Thank you for the feedback, I have made the requested changes, let me know if it's correct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (42d7a5c) to head (5a7d998).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #592   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         6453      6451    -2     
=========================================
- Hits          6453      6451    -2     

Flag	Coverage Δ
py3.10	85.90% <ø> (-0.01%)	⬇️
py3.10_all	98.83% <ø> (-0.01%)	⬇️
py3.10_pydantic1	49.17% <ø> (+0.01%)	⬆️
py3.10_pydantic2	48.95% <ø> (+0.01%)	⬆️
py3.10_types	98.85% <ø> (-0.01%)	⬇️
py3.11	85.87% <ø> (-0.01%)	⬇️
py3.11_all	98.79% <ø> (-0.01%)	⬇️
py3.11_types	98.80% <ø> (-0.01%)	⬇️
py3.12	86.03% <ø> (-0.01%)	⬇️
py3.12_all	98.80% <ø> (-0.01%)	⬇️
py3.12_types	98.82% <ø> (-0.01%)	⬇️
py3.8	86.54% <ø> (-0.01%)	⬇️
py3.8_all	99.47% <ø> (-0.01%)	⬇️
py3.8_types	99.50% <ø> (-0.01%)	⬇️
py3.9	86.46% <ø> (-0.01%)	⬇️
py3.9_all	99.42% <ø> (-0.01%)	⬇️
py3.9_types	99.44% <ø> (-0.01%)	⬇️

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud