fix undefined `learning_outcome_links` within a group context

closes OUT-3735
flag=none

test-plan:
- Enable the outcome_alignment_non_scoring_content FF
- Within a course, create a group (under People)
- Navigate to the group and create a page within it
- Visit the newly created page and make sure no errors occur

Change-Id: I23e3dbb126e3177a6e037250c81307d5eb44fb2e
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/241455
Reviewed-by: Augusto Callejas <acallejas@instructure.com>
Reviewed-by: Michael Brewer-Davis <mbd@instructure.com>
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
QA-Review: Michael Brewer-Davis <mbd@instructure.com>
Product-Review: Michael Brewer-Davis <mbd@instructure.com>

app/helpers/canvas_outcomes_helper.rb

@@ -18,6 +18,11 @@
 
 module CanvasOutcomesHelper
   def set_outcomes_alignment_js_env(artifact, context, props)
+    context =
+      case context
+      when Group then context.context
+      else context
+      end
     # don't show for contexts without alignmments
     return if context.learning_outcome_links.empty?
 

spec/helpers/canvas_outcomes_helper_spec.rb

@@ -88,6 +88,27 @@ describe CanvasOutcomesHelper do
 
         it_behaves_like 'valid js_env settings'
       end
+
+      context 'within a Group' do
+        before do
+          outcome_model(context: @course)
+          @group = @course.groups.create(:name => "some group")
+        end
+
+        it 'sets js_env with the group.context values' do
+          expect(subject).to receive(:extract_domain_jwt).and_return ['domain', 'jwt']
+          expect(subject).to receive(:js_env).with({
+            canvas_outcomes: {
+              artifact_type: 'canvas.page',
+              artifact_id: wiki_page.id,
+              context_uuid: @course.uuid,
+              host: 'http://domain',
+              jwt: 'jwt'
+            }
+          })
+          subject.set_outcomes_alignment_js_env(wiki_page, @group, {})
+        end
+      end
     end
   end