fix invalid memory address or nil pointer dereference in RetrieveFeatures

[corneldamian]

fix invalid memory address or nil pointer dereference when calling TestSuite RetrieveFeatures

🏷️ What kind of change is this?

• 🐛 Bug fix (non-breaking change which fixes a defect)

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

[hiyers]

@corneldamian what are the steps to take this forward? Can I help with rebase?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 83.30%. Comparing base (153db4e) to head (084e187).
Report is 3 commits behind head on main.

Files	Patch %	Lines
run.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #566      +/-   ##
==========================================
+ Coverage   83.21%   83.30%   +0.09%     
==========================================
  Files          28       28              
  Lines        3413     2743     -670     
==========================================
- Hits         2840     2285     -555     
+ Misses        458      342     -116     
- Partials      115      116       +1     

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[aslakhellesoy]

Hi @corneldamian,

Thanks for your making your first contribution to Cucumber, and welcome to the Cucumber committers team! You can now push directly to this repo and all other repos under the cucumber organization! 🍾

In return for this generous offer we hope you will:

• ✅ Continue to use branches and pull requests. When someone on the core team approves a pull request (yours or someone else's), you're welcome to merge it yourself.
• 💚 Commit to setting a good example by following and upholding our code of conduct in your interactions with other collaborators and users.
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• ℹ️ Don't feel obliged to help, just do what you can if you have the time and the energy.
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On behalf of the Cucumber core team,
Aslak Hellesøy
Creator of Cucumber