Stop "no such file or directory" warnings

```
Warning: scandir(/var/www/wc-logs/): failed to open dir: No such file or directory in /var/www/woocommerce-dev/wp-content/plugins/woocommerce/includes/admin/class-wc-admin-status.php on line 283

Warning: scandir(): (errno 2): No such file or directory in /var/www/wc-dev/wp-content/plugins/woocommerce/includes/admin/class-wc-admin-status.php on line 283
```