• Fix region assignment logic to return null instead of undefined
• Prevent TypeORM from assigning first available region when no region found
• Fix Slack warning message logic (show warning when region is missing)
• Add enhanced logging for sites without regions
• Add comprehensive tests for region handling logic
• All tests passing: ✅ 6/6

This addresses the issue where 273 sites were incorrectly assigned to ‘Sabah, Malaysia’ when getGoogleRegion returned undefined. Now sites with undefined regions will be left blank instead of being assigned to the first available region in the database.

/claim #1137