Notice: Undefined variable: theme_font_locations ... \typecase\customizer.php on line 58

In case no one else has reported it, I receive this error when I turn WP_DEBUG on and I think it is a very easy fix.
Current line 58:

```
        if( $theme_font_locations === false ){
```

Suggested fix to line 58:

```
        if( $this->theme_font_locations === false ){
```
