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

📋 Checklist:

• [x] 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[bot]]

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 :warning:

Additional details and impacted files

```diff @@ 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.
• 💬 Join the community Slack channel to meet the rest of the team and make yourself at home.
• 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