Refactor repetitive try-except blocks using _safe_calculate_metric helper
function to reduce code duplication and improve maintainability.
Changes:
- Add _safe_calculate_metric helper to centralize error handling
- Remove misleading default values (0/"unknown") in summary fields
- Use None defaults instead to clearly indicate unavailable data
- Add final newline to file per convention
This prevents LLMs from misinterpreting 0 as "zero investment potential"
when it actually means "data unavailable".
Addresses PR #2 review comments on lines 733, 749, and 759.
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Co-Authored-By: Claude <noreply@anthropic.com>
Nitzan Pomerantz
ac6c780419