Fix: prevent undefined entry in getFHECounterByChainId

[solotop999]

Summary

This PR fixes a potential runtime error in getFHECounterByChainId inside useFHECounter.tsx.

Previously, the code checked for "address" in entry without verifying whether entry was defined.
If FHECounterAddresses[chainId] returned undefined, it would throw: TypeError: Cannot use 'in' operator to search for 'address' in undefined

Changes

• Updated the condition to safely check entry?.address before accessing it.
• Prevents crashes when entry is undefined (e.g., when a chainId is not in FHECounterAddresses).

Before:

if (!("address" in entry) || entry.address === ethers.ZeroAddress) {
  return { abi: FHECounterABI.abi, chainId };
}

After:

if (!entry?.address || entry.address === ethers.ZeroAddress) {
  return { abi: FHECounterABI.abi, chainId };
}

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