Ignore undefined values for autoindex and health check (#80)

* Ignore undefined autoindex

* ignore undefined health_check_plus

Author: evilhamsterman

templates/http/default.conf.j2

@@ -23,14 +23,14 @@ server {
     listen {{ item.value.port }};
 {% endif %}
     server_name {{ item.value.server_name }};
-{% if item.value.autoindex %}
+{% if item.value.autoindex is defined and item.value.autoindex %}
     autoindex on;
 {% endif %}
 {% if item.value.load_balancer is defined %}
 {% for location in item.value.load_balancer.locations %}
     location {{ item.value.load_balancer.locations[location].location }} {
         proxy_pass http://{{ item.value.load_balancer.locations[location].proxy_pass }};
-{% if item.value.load_balancer.health_check_plus %}
+{% if item.value.load_balancer.health_check_plus is defined and item.value.load_balancer.health_check_plus %}
         health_check;
 {% endif %}
         proxy_set_header Host $host;