Fix remaining undefined array access error on blockchain visualization page.
When blockchainData exists but blocks is undefined, accessing .length would crash:
- "can't access property 'length', e is undefined"
CHANGES:
1. Blockchain page (blockchain/page.tsx):
- Ensure blocks array always exists when API data is fetched
- Provide fallback to empty array with verification object
- Add null check before accessing blocks.length in conditional render
This is the final fix for all frontend undefined array access issues.
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Co-Authored-By: Claude <noreply@anthropic.com>
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