Bug: new workers not logging traceback in case of exception #189
Description
Example:
2016-12-19T22:47:23 ERROR [process=Process-1, pid=394]: workflow decision failed: S3ResponseError: 404 Not Found
... and no traceback logged. Code here: https://github.com/botify-labs/simpleflow/blob/master/simpleflow/swf/process/decider/base.py#L170-L171
A similar problem was found in 7c7cc9f but not totally fixed.
We should ensure that whenever an error happens, we have the full details in the logs.