Merge pull request #903 from MITx/fix/cdodge/broken-path-to-view-subsection

when calling jump_to when location=<id-of-sequential> then Position is b...

lms/djangoapps/courseware/views.py

@@ -325,6 +325,12 @@ def jump_to(request, course_id, location):
     except NoPathToItem:
         raise Http404("This location is not in any class: {0}".format(location))
 
+    # cdodge: the CAS is generating a link to the LMS for 'subsections' (aka sequentials)
+    # and there is no associated 'Position' for this. The above Path_to_location is returning None for Position
+    # however, this ends up producing a 404 on the redirect
+    if position is None:
+        position = 0
+
     # Rely on index to do all error handling and access control.
     return redirect('courseware_position',
                     course_id=course_id,