Fix non-revealed chapters in ModuleView

Fixes apluslms#1266

Author: PasiSa

course/views.py

@@ -250,8 +250,8 @@ def get_common_objects(self):
         super().get_common_objects()
         self.now = timezone.now()
         try:
-            self.children = self.content.flat_module(self.module)
-            cur, _tree, prev, nex = self.content.find(self.module)
+            self.children = self.points.flat_module(self.module)
+            cur, _tree, prev, nex = self.points.find(self.module)
             self.previous = prev
             self.current = cur
             self.next = nex