We have a feature that you can tell the system that a match can't be finished until all games are played or the race to is reached. Meaning that if the boxes aren't all filled, it won't accept the match to be "Finished".
To turn this option on go Round-Robin (Menu > Manage > Brackets/Round-Robins > Round-Robins.)
Select the Round-Robin,
Pencil to Edit,
Score Input Section,
Bottom of the section, Calc Method for Automatic Winner.
Choose Most Wins (All games played or race to reached)
Highest Score (All games played or unbeatable)