Jonas Jenwald 11ec2b7530 Convert DefaultExternalServices.fallback to an asynchronous method
This method currently accepts a callback-function, which does feel a bit old fashioned now. At the time that this code was introduced, native Promises didn't exist yet and there's a custom Promise-implementation used instead.

However, today with Promises and async/await being used *a lot* it seems reasonable to change `DefaultExternalServices.fallback` to an `async` method instead such that the callback-function can be removed.
2020-12-30 20:48:40 +01:00
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2020-12-26 13:04:32 +01:00