[BUG] If a task is interrupted before mlnotify.end() is called, it runs forver

[dcizin]

I had to kill a task since it was going to take too long - mltnoify will run forever unless I remember to manually call mlnotify.end(). Forgetting to call end() also prevents me from calling start() - it prints the warning "before hook was already called", which is not the most informative and doesn't tell me that it actually failed to start a new counter. Maybe it should suggest calling mlnotify.end() instead?

[SnirShechter]

Duplicate of #11