fix: contract calls count

[michele-franchi]

Description

Smart Contract details is not working. As a followup @janmichek, an entire page should not stop working if for example a count is not working.

Demo

Checklist:

• [ ] I have read and followed the Contributing Guide
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

[github-actions[bot]]

Deployed to https://pr-815-aescan.stg.service.aepps.com and https://pr-815-aescan-testnet.stg.service.aepps.com