Unhandled Error when the OC API returns a non-json response body.

[oliverheywood451]

In error situations when OC returns a raw string response body instead of a json response, the sdk method ThrowAuthExceptionAsync throws a not very helpful error "Object reference not set to an instance ....".

Here's code to re-create this error.

>             var oc = new OrderCloudClient(new OrderCloudClientConfig()
>             {
>                 ApiUrl = "https://sandboxapi.ordercloud.io/v1",
>                 AuthUrl = "https://sandboxapi.ordercloud.io/v1",
>                 ClientId = _settings.OrderCloudSettings.ClientID,
>                 ClientSecret = _settings.OrderCloudSettings.ClientSecret,
>                 Roles = new[] { ApiRole.FullAccess }
>             });
> 
>             var token = await oc.AuthenticateAsync();

The "/v1" in the url is incorrect and results in a response "The resource you are looking for has been removed, had its name changed, or is temporarily unavailable." from OC.