Exclude substituted lessons from coursebook

aleksis/apps/alsijil/models.py

@@ -530,7 +530,6 @@ class Documentation(CalendarEvent):
         """
 
         # 1. Find all LessonEvents for all Lessons of this Course in this date range
-        #  TODO: verify that substitutions don't break this
         events = LessonEvent.get_single_events(
             date_start,
             date_end,
@@ -538,6 +537,7 @@ class Documentation(CalendarEvent):
             {
                 "type": obj_type,
                 "id": obj_id,
+                "not_amended": True,
             },
             with_reference_object=True,
         )