Run a progression on an exercise only if more than 0 sets finished in a workout

[youhavejameswoods]

As a Liftosaur user, I’d like the progression script to only be run on exercises with >0 sets for the workout, so that ‘current decrease attempt’, ‘current increase attempts’, and/or weight isn’t changed when an exercise isn’t performed during a workout and I won’t have to manually update my program with the prior values after my workout is completed.

[astashov]

Fixed by 11423d64f2dd6326310959c9714dd8543771182c