Merge branch '34130-null-pipes' into 'master'

Resolve "Merge request says "Could not connect to the CI server", no CI or integration is configured"

See merge request gitlab-org/gitlab-ce!17053

app/assets/javascripts/vue_merge_request_widget/mr_widget_options.js

@@ -152,6 +152,7 @@ export default {
     },
     handleNotification(data) {
       if (data.ci_status === this.mr.ciStatus) return;
+      if (!data.pipeline) return;
       const label = data.pipeline.details.status.label;
       const title = `Pipeline ${label}`;

changelogs/unreleased/34130-null-pipes.yml

+---
+title: Prevent MR Widget error when no CI configured
+merge_request:
+author:
+type: fixed

spec/javascripts/vue_mr_widget/mr_widget_options_spec.js

@@ -295,6 +295,15 @@ describe('mrWidgetOptions', () => {
         expect(notify.notifyMe).not.toHaveBeenCalled();
       });
+
+      it('should not notify if no pipeline provided', () => {
+        vm.handleNotification({
+          ...data,
+          pipeline: undefined,
+        });
+
+        expect(notify.notifyMe).not.toHaveBeenCalled();
+      });
     });
     describe('resumePolling', () => {