Ensure default StorageClass reclaimPolicy is set to nil instead of emptystring when reclaim_policy undefined

roles/openshift_default_storage_class/tasks/main.yml

@@ -7,7 +7,7 @@
     parameters: "{{ openshift_storageclass_parameters }}"
     provisioner: "{{ openshift_storageclass_provisioner }}"
     mount_options: "{{ openshift_storageclass_mount_options }}"
-    reclaim_policy: "{{ openshift_storageclass_reclaim_policy | default(None) }}"
+    reclaim_policy: "{{ openshift_storageclass_reclaim_policy | default(omit, True) }}"
   run_once: true
 
 - when: openshift_cloudprovider_kind == 'azure'