Sanitize some if statements in jinja2

tasks/configure.yml

@@ -3,7 +3,7 @@
 
 - name: "Configure Fail2Ban"
   template:
-    src: 'fail2ban_{{ item }}'
+    src: 'fail2ban_{{ item }}.jinja2'
     dest: '/etc/fail2ban/{{ item }}'
     owner: 'root'
     group: 'root'

templates/fail2ban_jail.local → templates/fail2ban_jail.local.jinja2

 [sshd]
 enabled = true
-{% if inventory_hostname in groups['webserver'] %}
+{% if 'webserver' in groups and inventory_hostname in groups['webserver'] %}
 
 [apache-auth]
 enabled = true
@@ -52,7 +52,7 @@ enabled = true
 logpath = %(apache_access_log)s
           %(apache_jail_access_log)s
 {% endif %}
-{% if inventory_hostname in groups['webserver-drupal'] %}
+{% if 'webserver-drupal' in groups and inventory_hostname in groups['webserver-drupal'] %}
 
 [drupal-auth]
 enabled = true