apache: Fix the task that adds additional modules when we have an empty list.

library/roles/apache/defaults/main.yml

@@ -82,7 +82,7 @@ apache_additional_packages_list:
 #
 # Set this variable to load the modules you need
 apache_additional_modules: False
-apache_additional_modules_list:
+apache_additional_modules_list: []
 #  -
 #  -
 

library/roles/apache/tasks/apache-modules.yml

@@ -34,7 +34,7 @@
 - name: Load additional apache modules if any
   apache2_module: name={{ item }} state=present
   with_items: '{{ apache_additional_modules_list  | default ([]) }}'
-  when: apache_additional_modules_list is defined
+  when: apache_additional_modules | bool
   notify: apache2 reload
   tags: [ 'apache', 'apache_mods' ]