Don't assume online- improve stripe error handling

[chrisjsimpson]

Is your feature request related to a problem? Please describe.

Currently the dashboard assumes the Stripe is OK/live. If the shop is offline (e.g. development) , not connected, then these conditions are not handled with a specific error handler.

Describe the solution you'd like
Improve error handling with specific error handler.

Describe alternatives you've considered

Additional context
Aids with local development