add noindex when map status isn't public

umap/templates/leaflet_storage/map_detail.html

@@ -8,6 +8,9 @@
         {% leaflet_storage_css %}
     {% endcompress %}
     {% leaflet_storage_js locale=locale %}
+    {% if object.share_status != object.PUBLIC %}
+        <meta name="robots" content="noindex">
+    {% endif %}
 {% endblock %}
 
 {% block content %}