src/Extensions/ContentReviewDefaultSettings.php
protected function getWithDefault($field)
    {
        $value = $this->owner->getField($field);
        if ($value) {
            return $value;
        }
        // fallback to default value
        $defaults = $this->owner->config()->get('defaults');
        if (isset($defaults[$field])) {
            return $defaults[$field];
        }
    }
protected function getWithDefault($field)
    {
        $value = $this->owner->getField($field);
        if ($value) {
            return $value;
        }
        // fallback to default value
        $defaults = $this->owner->config()->get('defaults');
        if (isset($defaults[$field])) {
            return $defaults[$field];
        }
    }
Get the value of a user-configured field, falling back to the default if left blank.

@param string $field

@return string