Handle SubscriptionExists

[vapaj]

While we are checking if the customer already has the subscription in Vetrina, the client side and server side might not be in sync. So handle SubscriptionExists errors we get from Bottega.

[ae-mo]

@vapaj so after we have the info about a duplicate subscription from bottega, I guess we need to show an error view, correct?

[vapaj]

We need to think about a behaviour for that, it's not really an error from the UX point of view. The simplest solution would be to just close vetrina by calling the onClose prop (at least in this case, where we are embedding it in an article).