Cron Coin will fail if No UTX in Database

## Expected Behavior
Run the cron and ignore UTX until present

## Actual Behavior
```
TypeError: Cannot read property 'total' of undefined
    at syncCoin (I:\ccbc-explorer\cron\coin.js:67:27)
    at process.internalTickCallback (internal/process/next_tick.js:77:7)
```