When 0 is the initial value of a ui-money-mask, nothing shows up

To be more specific, suppose I had:

```

```

and `test` was `0` when I first loaded the page, then the input will show blank.
##

---
Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/24841343-when-0-is-the-initial-value-of-a-ui-money-mask-nothing-shows-up?utm_campaign=plugin&utm_content=tracker%2F1022469&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F1022469&utm_medium=issues&utm_source=github).