no message

 ---
 # tasks file for openresty
 
+# make sure path exist
 - stat:
     path:  "{{ path }}"
   register: stat_result
@@ -9,9 +10,19 @@
   when:  stat_result.stat.exists == False
 
 
+# make sure vaviable exist
+- name: make sure varivable exists
+  fail: 
+    msg: "{{ item }} not exits!"
+  when: {{item}} == ''
+  with_items:
+    - nameservers  
+
+
+#  make sure group exists
 - name: make sure groups exist in inventory file
   fail:
-    msg: "group {{ g }} not exist!"
+    msg: "group {{ item }} not exist!"
   when: item not in groups
   with_items:
     - java-nginx