Fixed syntax issue

tasks/server_type.yml

diff --git a/tasks/server_type.yml b/tasks/server_type.yml
index f9a5c57..be8c43d 100644
--- a/tasks/server_type.yml
+++ b/tasks/server_type.yml
@@ -12,4 +12,4 @@
 - name: Server self report
   debug:
     msg: "{{ hostvars[inventory_hostname][self_report_name] }}"
-  when: "{{ self_report_name }} is defined"
\ No newline at end of file
+  when: self_report_name is defined
\ No newline at end of file