Gumdrop\Application::getSourceLocation PHP Method

    public function getSourceLocation()
    {
        return $this->sourceLocation;
    }

 public function setDestinationFallback()
 {
     if ($this->app->getDestinationLocation() == '') {
         $this->app->setDestinationLocation($this->app->getSourceLocation() . '/_site');
     }
 }