Fix okx-evm action script (#2225)

* feat: add logging for JSON response and handle empty erc20Assets

* refactor: remove unnecessary logging from main function

Author: G-Gamja

_script/evm_okx/evm_okx.mjs

@@ -85,7 +85,7 @@ async function main() {
 
     const jsonResponse = await response.json();
 
-    const erc20Assets = jsonResponse.data;
+    const erc20Assets = jsonResponse.data || [];
 
     const currentAssetContractAddresses = currentAssets.map((asset) => {
       return asset.contract.toLowerCase();