TNL-4351 Fix bug with no-option reponses

It's valid for an assessment to have option = None.

Includes unit test addition.

openassessment/templates/openassessmentblock/staff_area/oa_student_info.html

@@ -124,7 +124,11 @@
                                         <div>{{ individual_assessment.title }} - {{ individual_assessment.option.label}}</div>
                                     {% endfor %}
                                 {% elif assessment.points == None %}
-                                    <div>{{ assessment.option.label }}</div>
+                                    {% if assessment.option != None %}
+                                        <div>{{ assessment.option.label }}</div>
+                                    {% else %}
+                                        <div>{% trans 'Feedback Recorded' %}</div>
+                                    {% endif %}
                                 {% endif %}
                                 </td>
                             {% endfor %}

openassessment/templates/openassessmentblock/staff_area/oa_student_info_assessment_detail.html

@@ -31,12 +31,20 @@
                     <tbody>
                     {% for criterion in rubric_criteria %}
                         {% for part in assessment.parts %}
-                            {% if part.option.criterion.name == criterion.name %}
+                            {% if part.criterion.name == criterion.name %}
                                 <tr>
                                     <td class="label">{{ criterion.label }}</td>
-                                    <td class="value">{{ part.option.label }}</td>
+                                    {% if part.option != None %}
+                                        <td class="value">{{ part.option.label }}</td>
+                                    {% else %}
+                                        <td class="value"></td>
+                                    {% endif %}
                                     <td class="value">{{ part.feedback }}</td>
-                                    <td class="value">{{ part.option.points }}</td>
+                                    {% if part.option != None %}
+                                        <td class="value">{{ part.option.points }}</td>
+                                    {% else %}
+                                        <td class="value"></td>
+                                    {% endif %}
                                     <td class="value">{{ criterion.total_value }}</td>
                                 </tr>
                             {% endif %}

openassessment/xblock/test/data/feedback_only_criterion_staff.xml

+<openassessment>
+    <title>Feedback only criterion</title>
+    <prompts>
+        <prompt>
+            <description>Given the state of the world today, what do you think should be done to combat poverty?</description>
+        </prompt>
+        <prompt>
+            <description>Given the state of the world today, what do you think should be done to combat pollution?</description>
+        </prompt>
+    </prompts>
+    <rubric>
+        <criterion feedback="required">
+            <name>vocabulary</name>
+            <prompt>This criterion accepts only written feedback, so it has no options</prompt>
+        </criterion>
+    </rubric>
+    <assessments>
+        <assessment name="staff-assessment" required="true"/>
+    </assessments>
+</openassessment>

openassessment/xblock/test/test_staff_area.py

@@ -247,6 +247,40 @@ class TestCourseStaff(XBlockHandlerTestCase):
         self.assertEquals(1, len(grade_details['criteria'][0]['assessments']))
         self.assertEquals('Self Assessment Grade', grade_details['criteria'][0]['assessments'][0]['title'])
 
+    @scenario('data/feedback_only_criterion_staff.xml', user_id='Bob')
+    def test_staff_area_student_info_staff_only_no_options(self, xblock):
+        # Simulate that we are course staff
+        xblock.xmodule_runtime = self._create_mock_runtime(
+            xblock.scope_ids.usage_id, True, False, "Bob"
+        )
+        xblock.runtime._services['user'] = NullUserService()
+        bob_item = STUDENT_ITEM.copy()
+        bob_item["item_id"] = xblock.scope_ids.usage_id
+        # Create a submission for Bob, and corresponding workflow.
+        submission = self._create_submission(
+            bob_item, prepare_submission_for_serialization(("Bob Answer 1", "Bob Answer 2")), ['staff']
+        )
+
+        # Bob assesses himself as staff.
+        staff_api.create_assessment(
+            submission['uuid'],
+            STUDENT_ITEM["student_id"],
+            {},  # no options available
+            {"vocabulary": "Good use of vocabulary!"},
+            ASSESSMENT_DICT['overall_feedback'],
+            {'criteria': xblock.rubric_criteria},
+        )
+
+        _, context = xblock.get_student_info_path_and_context("Bob")
+        self.assertIn(
+            "Good use of vocabulary!",
+            self.request(
+                xblock,
+                "render_student_info",
+                urllib.urlencode({"student_username": "Bob"})
+            )
+        )
+
     @scenario('data/staff_grade_scenario.xml', user_id='Bob')
     def test_staff_area_student_info_staff_only(self, xblock):
         # Simulate that we are course staff
@@ -494,7 +528,7 @@ class TestCourseStaff(XBlockHandlerTestCase):
         # Schedule training
         response = self.request(xblock, 'schedule_training', json.dumps({}), response_format='json')
         self.assertTrue(response['success'], msg=response.get('msg'))
-        self.assertTrue('workflow_uuid' in response)
+        self.assertIn('workflow_uuid', response)
 
     @scenario('data/example_based_assessment.xml', user_id='Bob')
     def test_not_displaying_schedule_training(self, xblock):