fix: prevent TypeError when Salesforce content[0] is None

[sentry]

This PR addresses issue WORKER-Z6V, a TypeError: argument of type 'NoneType' is not iterable occurring in app.tasks.upload.UploadProcessor.

The root cause was identified in services/report/languages/salesforce.py, specifically within the SalesforceProcessor.matches_content method. The method was attempting to perform a membership test ("name" in content[0]) on content[0] without first verifying that content[0] was not None.

The parsed_report for certain Salesforce uploads could contain None as its first element (e.g., [None, {...}]). When content[0] was None, the in operator raised a TypeError because NoneType is not iterable.

This fix adds an explicit check (content[0] is not None) to ensure that content[0] is a valid iterable before attempting the membership test, thus preventing the TypeError.

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Fixes WORKER-Z6V

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.63%. Comparing base (a8ec2db) to head (3f64a32).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2023   +/-   ##
=======================================
  Coverage   91.63%   91.63%           
=======================================
  Files        1336     1336           
  Lines       53230    53230           
  Branches     1647     1647           
=======================================
  Hits        48778    48778           
  Misses       4131     4131           
  Partials      321      321           

Flag	Coverage Δ
workerintegration	58.49% <0.00%> (ø)
workerunit	90.55% <100.00%> (ø)

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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