undefine celery_worker to turn it off

playbooks/edx-west/stage-app.yml

@@ -28,8 +28,7 @@
       - verify
       nginx_template_directory: "{{local_dir}}/nginx/templates/"
     - role: edxapp
-      devstack: False
-      celery_worker: False
+      devstack: false
     - apache
     - shibboleth
     #- datadog

playbooks/roles/edxapp/handlers/main.yml

@@ -5,7 +5,7 @@
     supervisorctl_path={{ supervisor_ctl }}
     config={{ supervisor_cfg }}
     name="edxapp:{{ item }}"
-  when: not devstack and not celery_worker
+  when: not devstack and celery_worker is not defined
   sudo_user: "{{ supervisor_service_user }}"
   with_items: service_variants_enabled
   tags: deploy

playbooks/roles/edxapp/tasks/deploy.yml

@@ -298,7 +298,7 @@
     config={{ supervisor_cfg }}
     name="edxapp:{{ item }}"
   sudo_user: "{{ supervisor_service_user }}"
-  when: not devstack and not celery_worker
+  when: not devstack and celery_worker is not defined
   with_items: service_variants_enabled
   tags: deploy