Function attribute

attribute(attribute, condition): Handlebars.SafeString
This function renders an inline attribute when condition resolves to true.

Example
```
<div{{attribute ' style="display: block;"' visible}}></div>
```
Parameters
- attribute: string
  
  The attribute to be rendered
- condition: any
  
  The value that is evaluated to determine whether to render attribute
Returns Handlebars.SafeString
attribute if condition resolves to true, otherwise an empty string