Restore performance--fix a potential slight slowdown introduced by PR#1000

[kwekmaster]

My oversight introduced a potential performance difference for Process All in #1000
This may be observed when the user has a lot of files to process. I figured I'd do the right thing while it's still fresh in my brain.

Fixed:

• Flip the boolean condition check so Process All results in a short-circuit eval, theoretically providing equal performance as before.
• use the total variable--this approach wasn't introduced in my change, but I feel that we should be consistent. Might as well.