Use folder buttons in empty state

It’s confusing to have one way of adding things when your service is new
(green button) but a different way once you’ve added your first thing
(the new grey buttons).

For services that have a `edit_folders` permission, this commit
standardises on the grey buttons for a consistent experience.

app/templates/views/templates/_template_list.html

@@ -1,7 +1,7 @@
 {% from "components/checkbox.html" import unlabelled_checkbox %}
 {% from "components/message-count-label.html" import folder_contents_count, message_count_label %}
 
-{% if not template_list.templates_to_show %}
+{% if template_list.template_folder_id and not template_list.templates_to_show %}
   <p class="template-list-empty">
     {% if template_list.folder_is_empty %}
       This folder is empty

app/templates/views/templates/choose.html

@@ -34,7 +34,6 @@
            emails or text messages
          {%- endif %}.
        </p>
-      <a href="{{ url_for('.add_template_by_type', service_id=current_service.id) }}" class="button">Add a new template</a>
     {% else %}
       <p>
         You need to ask your service manager to add templates before you can send
@@ -71,7 +70,7 @@
         {% endif %}
       {% endif %}
     </div>
-
+  {% endif %}
     {% if show_template_nav %}
       <div class="bottom-gutter">
         {{ pill(template_nav_items, current_value=template_type, show_count=False) }}
@@ -91,7 +90,10 @@
 
     {% else %}
       {% include 'views/templates/_template_list.html' %}
+      {% if (not current_service.all_templates) and (not current_service.all_template_folders) and current_user.has_permissions('manage_templates') %}
+        <a href="{{ url_for('.add_template_by_type', service_id=current_service.id) }}" class="button">Add a new template</a>
+      {% endif %}
     {% endif %}
-  {% endif %}
+
 
 {% endblock %}