Update application.yml.j2

Author: durera

ibm/mas_devops/roles/suite_app_install/templates/application.yml.j2

@@ -7,7 +7,7 @@ metadata:
   labels:
     mas.ibm.com/instanceId: {{ mas_instance_id }}
     mas.ibm.com/applicationId: {{ mas_app_id }}
-{% if custom_labels is defined and custom_labels.items() %}
+{% if custom_labels is defined and custom_labels is not none and custom_labels.items() %}
 {% for key, value in custom_labels.items() %}
     "{{ key }}": "{{ value }}"
 {% endfor %}