[Bugfix] Eror messages from Zou would not be returned properly #341
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Problem
Zou returns json objects with the 'error' key instead of 'message'.
As an example; See https://github.com/cgwire/zou/blob/7f217f6be8cbc6eb1b10d80ca465c823b0aede40/zou/app/blueprints/files/resources.py#L705
Solution
I've added a utility function that checks a given request for the presence of both 'message' and 'error' keys, so that the error message of Zou can be properly passed on.
I also updated the UnitTests to test the following scenario's: verifying that the error message raised matches the one given by Zou and properly handling the error message when attempting to create a duplicate working file.