vhost: fix defaults for matchers

roles/vhost/templates/Caddyfile_block.j2

@@ -10,10 +10,10 @@
      {% for matcher in location.matchers %}
       {% if matcher.name != '' %}
         @{{ matcher.name }} {
-          {% if matcher.match_methods | length > 0 %}
+          {% if matcher.match_methods | default([]) | length > 0 %}
             method {{ matcher.match_methods | join(' ') }}
           {% endif %}
-          {% for header in matcher.match_headers | dict2items %}
+          {% for header in matcher.match_headers | default({}) | dict2items %}
             header{{ '_regexp' if header.value.startswith('^') and header.value.endswith('$') else '' }} {{ header.key }} {{ header.value }}
           {% endfor %}
         }

roles/vhost/vars/main.yaml

@@ -1,7 +1,7 @@
 ---
 _vhost_matcher_defaults:
   match_headers: {}
-  match_method: []
+  match_methods: []
 _vhost_matchers: >-
   {{
     vhost_matchers