Exception thrown by the WooCommerce REST API wrapper

[anghelalexandra]

Describe the bug
REST API routes for retrieving products, categories, etc. are throwing an exception.

(
    [request:Automattic\WooCommerce\HttpClient\HttpClientException:private] => Automattic\WooCommerce\HttpClient\Request Object
        (
            [url:Automattic\WooCommerce\HttpClient\Request:private] => .../wp-json/wc/v2/products/categories
            [method:Automattic\WooCommerce\HttpClient\Request:private] => GET
            [parameters:Automattic\WooCommerce\HttpClient\Request:private] => Array
                (
                )

            [headers:Automattic\WooCommerce\HttpClient\Request:private] => Array
                (
                    [Accept] => application/json
                    [User-Agent] => WooCommerce API Client-PHP/1.3.0
                )

            [body:Automattic\WooCommerce\HttpClient\Request:private] => 
        )

    [response:Automattic\WooCommerce\HttpClient\HttpClientException:private] => Automattic\WooCommerce\HttpClient\Response Object
        (
            [code:Automattic\WooCommerce\HttpClient\Response:private] => 401
            [headers:Automattic\WooCommerce\HttpClient\Response:private] => Array
                (
                    [Server] => nginx
                    [Date] => Fri, 10 Aug 2018 15:21:08 GMT
                    [Content-Type] => application/json; charset=UTF-8
                    [Transfer-Encoding] => chunked
                    [Connection] => keep-alive
                    [X-Robots-Tag] => noindex
                    [Link] => <.../wp-json/>; rel="https://api.w.org/"
                    [X-Content-Type-Options] => nosniff
                    [Access-Control-Expose-Headers] => X-WP-Total, X-WP-TotalPages
                    [Access-Control-Allow-Headers] => Authorization, Content-Type
                    [Set-Cookie] => pwacommerce_load_app=0; expires=Sun, 12-Aug-2018 15:21:08 GMT; Max-Age=172800; path=/
                    [X-Powered-By] => Loading
                )

            [body:Automattic\WooCommerce\HttpClient\Response:private] => {"code":"woocommerce_rest_cannot_view","message":"Lo siento, no puedes listar los recursos.","data":{"status":401}}

To Reproduce
Steps to reproduce the behavior:

1. Create WooCommerce REST API key / secret
2. Save key / secret in the PWACommerce settings page
3. Go to the following URL: https://yourdomain/wp-json/pwacommerce/categories/
4. A HTTP 500 error is displayed.

Expected behavior
Return JSON data so it can be used by the app.

WordPress / WooCommerce setup

• PHP Version: 7.0
• WordPress version: 4.9.8
• WooCommerce plugin version: 3.4.4
• PWACommerce Plugin Version: 0.1
• Other WooCommerce plugins that you are using: WooCommerce Services (https://es.wordpress.org/plugins/woocommerce-services/)

Additional context
Exception catching should also be added so the HTTP 500 status can be replaced with a user friendly message.