fix(evm): L02 _destinationSettler Can Return Zero Address (#834)

* fix: L02 _destinationSettler Can Return Zero Address

* updated implementation to be in internal function

Signed-off-by: Chris Maree <christopher.maree@gmail.com>

---------

Signed-off-by: Chris Maree <christopher.maree@gmail.com>
Co-authored-by: Chris Maree <christopher.maree@gmail.com>
Co-authored-by: nicholaspai <npai.nyc@gmail.com>

Author: 3 people

contracts/erc7683/ERC7683OrderDepositor.sol

@@ -26,6 +26,7 @@ abstract contract ERC7683OrderDepositor is IOriginSettler {
     error WrongChainId();
     error WrongOrderDataType();
     error WrongExclusiveRelayer();
+    error NoDestinationSettlerForChain(uint256 chainId);
 
     // Permit2 contract for this network.
     IPermit2 public immutable PERMIT2;

contracts/erc7683/ERC7683OrderDepositorExternal.sol

@@ -101,6 +101,7 @@ contract ERC7683OrderDepositorExternal is ERC7683OrderDepositor, Ownable, MultiC
     }
 
     function _destinationSettler(uint256 chainId) internal view override returns (address) {
+        if (destinationSettlers[chainId] == address(0)) revert NoDestinationSettlerForChain(chainId);
         return destinationSettlers[chainId];
     }
 }