fix: handle missing related asset fields in assetsToDf function

[jondricek]

This pull request improves the robustness of the assetsToDf function in stixToDf.py by adding error handling and logging for missing fields in related asset data. This ensures that missing or incomplete data does not cause the export process to fail and provides clear error messages for easier debugging.

Error handling and logging improvements:

• Added checks for the presence of the name, related_asset_sectors, and description fields in each related_asset. If any of these fields are missing, a detailed error message is logged and a blank value is added to the corresponding output field, allowing the export to continue smoothly.
• Included additional context in error logs by capturing the asset's name, ATT&CK ID, and STIX ID, making it easier to identify problematic assets during debugging.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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