fix: Some attestation payloads caused the subgraph to fail while indexing

[alainncls]

What does this PR do?

Related ticket

Fixes #

Type of change

• Chore
• Bug fix
• New feature
• Documentation update

Check list

• Unit tests for any smart contract change
• Contracts and functions are documented

[netlify]

✅ Deploy Preview for verax-tutorial ready!

Name	Link
🔨 Latest commit	6264543
🔍 Latest deploy log	https://app.netlify.com/sites/verax-tutorial/deploys/6650d8de444b030008733acd
😎 Deploy Preview	https://deploy-preview-611--verax-tutorial.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[github-actions]

🚀 Deployed on https://6650d928b84e2352e8649558--resilient-starburst-d5d6d9.netlify.app

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.53%. Comparing base (c5ad56c) to head (6264543).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #611   +/-   ##
=======================================
  Coverage   92.53%   92.53%           
=======================================
  Files          30       30           
  Lines         482      482           
  Branches      114      114           
=======================================
  Hits          446      446           
  Misses         24       24           
  Partials       12       12           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.