Fixed errors being swallowed in oembed service
Fixed errors being swallowed in oembed service

no issue

When switching the oembed service to async/await the error handling was not correctly refactored. `this.errorHandler(url)` was returning a curried function so it could be used as `.catch(this.errorHandler(url))` but that's not how it's being used after the async/await change meaning we were returning a function rather than the result of that function.

- `this.errorHandler(url)` is now only used in one place where `url` is available so removed the method and moved the body of the curried function inline into the `catch` handler
- added a message to the logged error so it's more clear what the log refers to

ErisDS/Ghost,TryGhost/Ghost,ErisDS/Ghost,e10/Ghost,TryGhost/Ghost,ErisDS/Ghost,TryGhost/Ghost,e10/Ghost