fix: Handle non-dict previous_result in bundle analysis processor

[seer-by-sentry]

Fixes WORKER-Q80. The issue was that: Celery task chain initialized with list [] instead of expected dictionary, causing previous_result.get() to fail.

• Added defensive handling to check if previous_result is a dictionary.
• If previous_result is not a dictionary, log a warning with relevant context and initialize processing_results to an empty list to prevent errors.

This fix was generated by Seer in Sentry, triggered by Max Weng. 👁️ Run ID: 1649849

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[sentry]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.81%. Comparing base (7ef1718) to head (2739fcb).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/worker/tasks/bundle_analysis_processor.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #516      +/-   ##
==========================================
- Coverage   93.82%   93.81%   -0.01%     
==========================================
  Files        1279     1279              
  Lines       46084    46087       +3     
  Branches     1511     1511              
==========================================
+ Hits        43237    43238       +1     
- Misses       2539     2541       +2     
  Partials      308      308              

Flag	Coverage Δ
workerintegration	58.80% <0.00%> (-0.02%)	⬇️
workerunit	91.13% <50.00%> (-0.02%)	⬇️

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[codecov-notifications]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/worker/tasks/bundle_analysis_processor.py	50.00%	2 Missing ⚠️

❌ Your patch check has failed because the patch coverage (50.00%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

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