fix(revit): prevent null reference when extracting workset properties from linked model elements

[bjoernsteinhagen]

Description

Fixed a NullReferenceException in ClassPropertiesExtractor.ExtractElementProperties() that occurred when exporting rooms from linked Revit files. The bug happened because the code was trying to look up worksets from linked model elements using the main document's workset table instead of the element's own document.

The fix ensures we use element.Document.GetWorksetTable() instead of _converterSettings.Current.Document.GetWorksetTable() and adds proper error handling for edge cases.

Fixes CNX-2414.

User Value

Users can now successfully export rooms from linked files without getting "Revit Operation Failed" errors.

Changes:

• Updated ExtractElementProperties() to use element's own document for workset lookups
• Added try-catch block with fallback to "Unknown Workset" if workset lookup fails
• Prevents cross-document workset reference errors in linked model scenarios

Screenshots:

Before: Users got "Revit Operation Failed" with stack trace

After: Export completes successfully with proper workset names (or "Unknown Workset" fallback) -> model

Validation of changes:

• Tested with linked models containing rooms with worksets
• Verified that main model room exports still work correctly

Checklist:

• My commits are related to the pull request and do not amend unrelated code or documentation.
• I have added appropriate tests.
• I have updated or added relevant documentation.

[linear]

CNX-2414 Revit Operation Failed on Linked Rooms

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.06%. Comparing base (678f113) to head (254b3bf).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1052   +/-   ##
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  Coverage   41.06%   41.06%           
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  Files         109      109           
  Lines        3090     3090           
  Branches      295      295           
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  Hits         1269     1269           
  Misses       1775     1775           
  Partials       46       46           

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