Munin debugging tweaked

tasks/munin.yml

@@ -32,12 +32,16 @@
     - debug:
         msg: "Standard out from `munin-run apt_all` : {{ upgrade_munin_run_apt_all.stdout }}"
         verbosity: 1
-      when: upgrade_munin_run_apt_all.stdout is defined
+      when:
+        - upgrade_munin_run_apt_all.stdout is defined
+        - upgrade_munin_run_apt_all.stdout | length > 0
 
     - debug:
         msg: "Standard error from `munin-run apt_all` : {{ upgrade_munin_run_apt_all.stderr }}"
         verbosity: 1
-      when: upgrade_munin_run_apt_all.stderr is defined
+      when:
+        - upgrade_munin_run_apt_all.stderr is defined
+        - upgrade_munin_run_apt_all.stderr | length > 0
 
   when: upgrade_apt_state.changed or upgrade_apt_all_state.changed
   tags: