fix when empty
diff --git a/collectd/meta/collectd.yml b/collectd/meta/collectd.yml
index 9079e04..c67d99d 100644
--- a/collectd/meta/collectd.yml
+++ b/collectd/meta/collectd.yml
@@ -18,4 +18,6 @@
         - 1.3.6.1.2.1.31.1.1.1.7
         - 1.3.6.1.2.1.31.1.1.1.11
     host: {{ pillar.external.network_device }}
+{%- else %}
+plugin: {}
 {%- endif %}
\ No newline at end of file