Adding non-empty check.

playbooks/roles/notifier/templates/edx/app/supervisor/conf.d/notifier-celery-workers.conf.j2

@@ -27,5 +27,5 @@ stderr_logfile_backups=10
 stderr_capture_maxbytes=1MB
 environment=PID='/var/tmp/notifier-celery-workers.pid',LANG=en_US.UTF-8,
 {%- for name,value in notifier_env_vars.items() -%}
-{{name}}="{{value}}"{%- if not loop.last -%},{%- endif -%}
+{%- if value -%}{{name}}="{{value}}"{%- if not loop.last -%},{%- endif -%}{%- endif -%}
 {%- endfor -%}

playbooks/roles/notifier/templates/edx/app/supervisor/conf.d/notifier-scheduler.conf.j2

@@ -27,5 +27,5 @@ stderr_logfile_backups=10
 stderr_capture_maxbytes=1MB
 environment=PID='/var/tmp/notifier-scheduler.pid',LANG=en_US.UTF-8,
 {%- for name,value in notifier_env_vars.items() -%}
-{{name}}="{{value}}"{%- if not loop.last -%},{%- endif -%}
+{%- if value -%}{{name}}="{{value}}"{%- if not loop.last -%},{%- endif -%}{%- endif -%}
 {%- endfor -%}