Reverted change to error handling made in https://github.com/wtsi-hgi/python-baton-wrapper/commit/4b9bca40f3bf2f9fd83051c4dc2aed7368107f6d based on discussion in commit comments.
Reverted change to error handling made in https://github.com/wtsi-hgi/python-baton-wrapper/commit/4b9bca40f3bf2f9fd83051c4dc2aed7368107f6d based on discussion in commit comments.

wtsi-hgi/baton-python-wrapper,wtsi-hgi/baton-python-wrapper