redis: works with munin installed or not

redis/handlers/main.yml

@@ -3,3 +3,8 @@
   service:
     name: "{{ redis_daemon }}"
     state: restarted
+
+- name: restart munin-node
+  service:
+    name: munin-node
+    state: restarted

redis/tasks/main.yml

@@ -24,4 +24,10 @@
   tags:
   - redis
 
+- name: Is Munin installed
+  stat:
+    path: /etc/munin/plugins
+  register: _munin_installed
+
 - include: munin.yml
+  when: _munin_installed.stat.exists && _munin_installed.stat.isdir