Fix bug.

app/views/admin/ruling_templates/_form.html.erb

@@ -36,7 +36,7 @@
       <div class="control-group">
         <%= f.label :allow_domain, t("ruling_template.allow_domain"), :class => "control-label muted" %>
         <div class="controls">
-          <%= f.text_field :allow_domain, placeholder: 'example.com' %>
+          <%= f.text_field :allow_domain, placeholder: 'example.com', :value=>(f.object.allow_domain.class==Array ? f.object.allow_domain.join(",") : f.object.allow_domain)   %>
         </div>
       </div>
       <div class="control-group">