use access json header / extend error message parsing for stash #89
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As found in https://discourse.drone.io/t/panic-or-undefined-error-when-create-build-from-bitbucket-repository/8549/3
Somehow Bitbucket server does not always return a list of Errors, but only one message with status code.
This PR uses this rool-level message as error if present if the error list is empty.
It also sets the "Accept: application/json" header on the request, since the following code expects the response to be json.