Potential error in task handling code

[cderici]

If the utils.run_with_interrupt is ever called with log=None,

python-libjuju/juju/utils.py

Lines 146 to 161 in 43becc4

	async def run_with_interrupt(task, *events, log=None):
	"""
	Awaits a task while allowing it to be interrupted by one or more
	`asyncio.Event`s.
	If the task finishes without the events becoming set, the results of the
	task will be returned. If the event become set, the task will be cancelled
	``None`` will be returned.
	:param task: Task to run
	:param events: One or more `asyncio.Event`s which, if set, will interrupt
	`task` and cause it to be cancelled.
	"""
	task = jasyncio.create_task_with_handler(task, 'tmp', log)
	event_tasks = [jasyncio.ensure_future(event.wait()) for event in events]
	done, pending = await jasyncio.wait([task] + event_tasks,

then it'll cause the jasyncio.create_task_with_handler

python-libjuju/juju/jasyncio.py

Line 49 in 43becc4

def create_task_with_handler(coro, task_name, logger):

to break at the following line if the wrapped task raises an exception:

python-libjuju/juju/jasyncio.py

Line 75 in 43becc4

logger.exception("Task %s raised an exception: %s" % (task_name, e))

---

PR to follow with a small fix.