Hotfix: explorer missing vars throw 500

[uri-99]

hotfix explorer set all vars when catching a panic

Description

This PR makes the explorer home page to set all corresponding variables to :empty when handling a panic case.
The error was that there were a couple of new variables that were not set in a panic.

This is a hotfix, this same fix should be applied to all explorer pages

Type of change

Please delete options that are not relevant.

• New feature
• Bug fix
• Optimization
• Refactor

Checklist

• “Hotfix” to testnet, everything else to staging
• Linked to Github Issue
• This change depends on code or research by an external entity
  • Acknowledgements were updated to give credit
• Unit tests added
• This change requires new documentation.
  • Documentation has been added/updated.
• This change is an Optimization
  • Benchmarks added/run
• Has a known issue
  • Link to the open issue addressing it
• If your PR changes the Operator compatibility (Ex: Upgrade prover versions)
  • This PR adds compatibility for operator for both versions and do not change batcher/docs/examples
  • This PR updates batcher and docs/examples to the newer version. This requires the operator are already updated to be compatible