Fix python unit tests

lms/djangoapps/courseware/tests/test_module_render.py

@@ -18,7 +18,7 @@ from django.test.client import RequestFactory
 from django.test.utils import override_settings
 from edx_proctoring.api import create_exam, create_exam_attempt, update_attempt_status
 from edx_proctoring.runtime import set_runtime_service
-from edx_proctoring.tests.test_services import MockCreditService
+from edx_proctoring.tests.test_services import MockCreditService, MockGradesService
 from freezegun import freeze_time
 from milestones.tests.utils import MilestonesTestCaseMixin
 from mock import MagicMock, Mock, patch
@@ -995,6 +995,11 @@ class TestProctoringRendering(SharedModuleStoreTestCase):
             MockCreditService(enrollment_mode=enrollment_mode)
         )
 
+        set_runtime_service(
+            'grades',
+            MockGradesService()
+        )
+
         exam_id = create_exam(
             course_id=unicode(self.course_key),
             content_id=unicode(sequence.location),

lms/djangoapps/grades/new/subsection_grade.py

@@ -36,6 +36,8 @@ class SubsectionGradeBase(object):
         self.graded_total = None  # aggregated grade for all graded problems
         self.all_total = None  # aggregated grade for all problems, regardless of whether they are graded
 
+        self.override = None
+
     @property
     def attempted(self):
         """
@@ -108,7 +110,6 @@ class SubsectionGrade(SubsectionGradeBase):
             self._compute_block_score(descendant_key, course_structure, submissions_scores, csm_scores)
 
         self.all_total, self.graded_total = graders.aggregate_scores(self.problem_scores.values())
-        self.override = None
         self._log_event(log.debug, u"init_from_structure", student)
         return self