fix missing database.users on pillar
diff --git a/galera/server.sls b/galera/server.sls
index 487a8cd..4b84654 100644
--- a/galera/server.sls
+++ b/galera/server.sls
@@ -15,7 +15,7 @@
   - onlyif: /bin/false
   {%- endif %}
 
-{%- for user in database.users %}
+{%- for user in database.get('users', {}) %}
 mysql_user_{{ user.name }}_{{ database_name }}_{{ user.host }}:
   mysql_user.present:
   - host: '{{ user.host }}'