fix various bugs

[willopez]

Impact: minor
Type: bugfix

Issue

Fixes various small issues.

1. The availablePaymentMethods query should not executed if the shop id is not yet available
2. An error was being returned by an api route when the user was anonymous, it should not be an error, just a flag that says that the user is anonymous.
3. Add a not about a know issue with the anonymous cart query being executed unnecessarily, this is due to a know issue with Apollo Client: "Skip" property of useQuery hook has no effect apollographql/react-apollo#3492

Testing

1. Start with a fresh installation
2. Observe and verify that the api route for /token is NOT returning an error on any view.
3. Observe and verify that in the checkout page, the availablePaymentMethods query dose not return an error.

[ryan-veracitek]

We're seeing this bug "The availablePaymentMethods query should not executed if the shop id is not yet available" and the above fix does not appear to have made it to the code. In our storefront we cannot click checkout as storeid becomes null & language becomes German.