Jonas Jenwald df0e1edab5 Re-factor sending of various Exceptions from the worker to the API
As can be seen in the API, there's a number of document loading Exception handlers which are both really simple and highly similar. Hence these are changed such that all the relevant Exceptions are sent via *one* message instead.

Furthermore, the patch also avoids unnecessarily re-creating `UnknownErrorException`s at the worker side and removes an unnecessary `bind` call.
2019-10-19 12:54:54 +02:00
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