Fixed critical React error #306 by adding proper null handling for
reasoning and consequence fields in the dashboard service.
Issue: When database columns (reasoning, consequence) contain NULL
values, Python's .get() method returns None, which becomes undefined
in JavaScript, causing React to throw error #306 when trying to render.
Solution: Changed from `.get("field", "default")` to `.get("field") or "default"`
to properly handle None values throughout the dashboard service.
Changes:
- Purchase order actions: Added null coalescing for reasoning/consequence
- Production timeline: Added null coalescing for reasoning field
- Alert actions: Added null coalescing for description and source
- Onboarding actions: Added null coalescing for title and consequence
This ensures all text fields always have valid string values before
being sent to the frontend, preventing undefined rendering errors.
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