Issue with `@content` autofill

``` scss
/// Just a test
/// @content pass in whatever you want
@mixin test($one, $two: null) {}
```

All clear.

``` scss
/// Just a test
/// @content pass in whatever you want
@mixin test($one, $two: null) {
  @content;
}
```

Nothing printed.

``` scss
/// Just a test
@mixin test($one, $two: null) {
  @content;
}
```

Nothing printed.

``` json
{
  "autofill": []
}
```

All clear.
