chore: Remove unnecessary None checks

[sentrivana]

All of these should be lists, never None.

[github-actions]

Codecov Results 📊

✅ 70798 passed | ⏭️ 3370 skipped | Total: 74168 | Pass Rate: 95.46% | Execution Time: 220m 55s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -64868
Passed Tests	📉 -61107
Failed Tests	—
Skipped Tests	📉 -3761

All tests are passing successfully.

✅ Patch coverage is 93.33%. Project has 2268 uncovered lines.
❌ Project coverage is 90%. Comparing base (da4ae1c) to head (ad966c0).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/openai.py	75.00%	⚠️ 1 Missing

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
- Coverage    90.20%    90.00%     -0.2%
==========================================
  Files          193       185        -8
  Lines        25788     22678     -3110
  Branches      9530      8224     -1306
==========================================
+ Hits         23261     20410     -2851
- Misses        2527      2268      -259
- Partials      1432      1316      -116

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Generated by Codecov Action

[alexander-alderman-webb]

I've removed unnecessary checks in the other GenAI integrations as well.