fix: Resolve multiple exporter failures after database migration

[ArnavBallinCode]

After PR #1258 fixed the export page HTTP 500 error, This pr fixes issue #1282 , export functionality which was broken for some of the exporters

Issues found and fixed

• Code still referenced old item field instead of new product field
• JSON_FIELD_AVAILABLE setting was undefined
• Form data accessed without defaults
• Invalid Query Syntax**: Wrong Django filter methods
• Empty Data Handling**: No safeguards for reports with no data

Related Issues

• Fixes Export Functionality Broken #1282
• Follow-up to fix: unable to export order data – HTTP 500 error #1258 (export page fix)
• Follow-up to Ticket Component: Unable to Export Order Data – HTTP 500 Error #1250 (database migration)

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[mariobehling]

Please resolve conflicts.