Cron create exception if wallet not ready

[Aviator-Coding]

Expected Behavior

give a message wallet not ready

Actual Behavior

getinfo { code: -28, message: 'Rescanning...' }
Error: [object Object]
    at rpc.call (I:\ccbc-explorer\lib\rpc.js:51:18)
    at IncomingMessage.<anonymous> (I:\ccbc-explorer\node_modules\node-bitcoin-rpc\lib\index.js:74:9)
    at IncomingMessage.emit (events.js:187:15)
    at endReadableNT (_stream_readable.js:1094:12)
    at process.internalTickCallback (internal/process/next_tick.js:72:19)
From previous event:
    at RPC.call (I:\ccbc-explorer\lib\rpc.js:47:12)
    at update (I:\ccbc-explorer\cron\block.js:112:28)
    at Object.<anonymous> (I:\ccbc-explorer\cron\block.js:157:1)
    at Module._compile (internal/modules/cjs/loader.js:707:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:718:10)
    at Module.load (internal/modules/cjs/loader.js:605:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:544:12)
    at Function.Module._load (internal/modules/cjs/loader.js:536:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:760:12)
    at startup (internal/bootstrap/node.js:308:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:878:3)
{ Error: ENOENT: no such file or directory, unlink 'I:\ccbc-explorer\tmp\block.cron_lock'
    at Object.unlinkSync (fs.js:972:3)
    at Object.unlock (I:\ccbc-explorer\lib\locker.js:40:6)
    at update (I:\ccbc-explorer\cron\block.js:148:14)
  errno: -4058,
  syscall: 'unlink',
  code: 'ENOENT',
  path: 'I:\\ccbc-explorer\\tmp\\block.cron_lock' }