Fixes errors when running in check mode

tasks/locales-debian.yml

@@ -13,10 +13,13 @@
 - name: Extract LANG from current locale configuration
   set_fact:
     locale_lang: "{{ locale_status.stdout | regex_search('LANG=([^\n]+)', '\\1') | first }}"
+  when: local_status.stdout is defined
 
 - debug:
-    msg: "{{ locale_lang }}"
+    var: locale_lang
 
 - name: Set default locale
   command: localectl set-locale LANG={{ locales_default }}
-  when: locale_lang != locales_default
+  when:
+    - locale_lang is defined
+    - locale_lang != locales_default