a6234d1c4e
Currently when you are trying to set invalid additional property for task using py3 interpreter it will fail, because function `unicode` does not exist in py3. Fix it by replacing `unicode` with `utils.exception_to_str` which is used in other modules already. Change-Id: I5897868f801467a2eaa7585b5f2d578cef358426 Closes-Bug: 1439513