fix omr not storing the checkmarks for «no answer» boxes on multiple choice questions
fix omr not storing the checkmarks for «no answer» boxes on multiple choice questions

breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval