Make sure we render the category block in the event of no responses

opentech/apply/categories/blocks.py

@@ -77,11 +77,12 @@ class CategoryQuestionBlock(OptionalFormFieldBlock):
     def render(self, value, context):
         data = context['data']
         category = value['category']
-        context['data'] = category.options.filter(id__in=data).values_list('value', flat=True)
+        if data != self.no_response():
+            context['data'] = category.options.filter(id__in=data).values_list('value', flat=True)
         return super().render(value, context)
 
     def get_searchable_content(self, value, data):
         return None
 
     def no_response(self):
-        return None
+        return ['No Response']

opentech/apply/categories/tests/test_blocks.py

@@ -52,3 +52,9 @@ class TestCategoryQuestionBlock(TestCase):
             field.choices,
             [(option.id, option.value) for option in self.category.options.all()]
         )
+
+    def test_can_render_if_no_response(self):
+        context = self.block.get_context(None, {'data': None})
+        self.assertEqual(context['data'], self.block.no_response())
+        display = self.block.render({'category': self.category}, context)
+        self.assertIn(self.block.no_response()[0], display)