fix meta/salt with missing pillar

Change-Id: Ib5591bbeab0e037473445d9b976899935cdac215
diff --git a/openldap/meta/salt.yml b/openldap/meta/salt.yml
index 92f7534..1cf352e 100644
--- a/openldap/meta/salt.yml
+++ b/openldap/meta/salt.yml
@@ -1,5 +1,5 @@
 minion:
-  {%- if pillar.openldap.client is defined %}
+  {%- if pillar.get('openldap', {}).get('client') %}
   {%- from "openldap/map.jinja" import client with context -%}
   {%- if client.server is defined %}
   ldap: