fix oh dear url check

Author: baszoetekouw

roles/haproxy/tasks/acme.yml

@@ -69,6 +69,6 @@
     content: |
       MAILTO=surfconext-beheer@surf.nl
       30 07    * *   {{ haproxy_acme_cronjob_dow }}    acme    /home/acme/.acme.sh/acme.sh --cron --home /home/acme/.acme.sh > /dev/null
-      {%- if haproxy_acme_cronjob_monitor_url|bool and haproxy_acme_cronjob_monitor_url|length > 0 -%}
+      {%- if haproxy_acme_cronjob_monitor_url | default('') -%}
          {# #} && curl -fsS --retry 3 -o /dev/null {{ haproxy_acme_cronjob_monitor_url }}
       {%- endif %}