Handlebar syntax in view with comma breaks silently

Hi,

Suppose I have this label in my view, which concats a plain string to a data-bound variable:

``` xml
<Label text="{{ 'Hi ' + name }}" textWrap="true" style="horizontal-align: center"/>
```

That works fine. However, if I have "Hi, " instead of "Hi ", it will break silently.

``` xml
<Label text="{{ 'Hi, ' + name }}" textWrap="true" style="horizontal-align: center"/>
```
