Move a MIDI test in the table handling loop...

Move a MIDI test in the table handling loop...

...to later enable that condition truthiness to depend on the
loop iteration. The goal here is to prepare for the upcoming rewrite,
without introducing any policy change for now.

There is no behavior change because if all loop iterations are skipped,
then \found will be false, and with \imprecise being null the last
attempt will be skipped and we will return false.