Fix key error that can occur if course staff create assessments before releasing a problem

openassessment/xblock/grade_mixin.py

@@ -147,8 +147,15 @@ class GradeMixin(object):
 
         if median_scores is not None and max_scores is not None:
             for criterion in context["rubric_criteria"]:
-                criterion["median_score"] = median_scores[criterion["name"]]
-                criterion["total_value"] = max_scores[criterion["name"]]
+                # Although we prevent course authors from modifying criteria post-release,
+                # it's still possible for assessments created by course staff to
+                # have criteria that differ from the current problem definition.
+                # It's also possible to circumvent the post-release restriction
+                # if course authors directly import a course into Studio.
+                # If this happens, we simply leave the score blank so that the grade
+                # section can render without error.
+                criterion["median_score"] = median_scores.get(criterion["name"], '')
+                criterion["total_value"] = max_scores.get(criterion["name"], '')
 
         return ('openassessmentblock/grade/oa_grade_complete.html', context)
 

openassessment/xblock/test/test_grade.py

@@ -202,6 +202,28 @@ class TestGrade(XBlockHandlerTestCase):
         self.assertIn(u'Peer 2: ฝﻉɭɭ ɗѻกﻉ!', resp.decode('utf-8'))
         self.assertIn(u'Peer 2: ƒαιя נσв', resp.decode('utf-8'))
 
+    @scenario('data/grade_scenario.xml', user_id='Bob')
+    def test_assessment_does_not_match_rubric(self, xblock):
+         # Get to the grade complete section
+        self._create_submission_and_assessments(
+            xblock, self.SUBMISSION, self.PEERS, self.ASSESSMENTS, self.ASSESSMENTS[0]
+        )
+
+        # Change the problem definition so it no longer
+        # matches the assessments.  This should never happen
+        # for a student (since we prevent authors from doing this post-release),
+        # but it may happen if a course author has submitted
+        # an assessment for a problem before it was published,
+        # or if course authors mess around with course import.
+        xblock.rubric_criteria[0]["name"] = "CHANGED NAME!"
+
+        # Expect that the page renders without an error
+        # It won't show the assessment criterion that changed
+        # (since it's not part of the original assessment),
+        # but at least it won't display an error.
+        resp = self.request(xblock, 'render_grade', json.dumps({}))
+        self.assertGreater(resp, 0)
+
     @ddt.file_data('data/waiting_scenarios.json')
     @scenario('data/grade_waiting_scenario.xml', user_id='Omar')
     def test_grade_waiting(self, xblock, data):