ripple/ripple-rest — pull request #231 by lumberj (2014-12-04 22:53:52+00:00)
Title: [BUG] Empty string is not a valid UINT32

Before:

```javascript
> validator.isValid('', 'UINT32')
true

> validator.isValid('f', 'UINT32')
false
```

After:

```javascript
> validator.isValid('', 'UINT32')
false
```