Merge branch 'hotfix-homework-500-error' into 'develop'

bag_fix

See merge request !50

courses/views.py

@@ -47,9 +47,9 @@ def course(request, slug):
             _map = CourseMap.objects.filter(course=course).order_by('sort').first()
             _j = _map.get_obj()
             if _map._type == 'H':
-                j = HomeworkJ.objects.get(material=_j, student=request.user)
+                j, _created = HomeworkJ.objects.get_or_create(material=_j, student=request.user)
             if _map._type == 'L':
-                j = LessonJ.objects.get(material=_j, student=request.user)
+                j, _created = LessonJ.objects.get_or_create(material=_j, student=request.user)
             j.open_material()
     else:
         journal, created = TeacherJ.objects.get_or_create(course=course, student=user_fabric(request.user))