Add missing Documentation import

aleksis/apps/alsijil/schema/absences.py

@@ -4,7 +4,7 @@ from datetime import datetime
 from aleksis.apps.kolego.models import Absence
 
 from .documentation import DocumentationType
-from ..models import ParticipationStatus
+from ..models import Documentation, ParticipationStatus
 
 class LessonsForPersonType(graphene.ObjectType):
     id = graphene.ID()  # noqa