<p><b>@mmd-osm</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2223#discussion_r300419078">app/views/api/map/index.xml.builder</a>:</p>
<pre style='color:#555'>> @@ -0,0 +1,8 @@
+xml.instruct!
+
+xml.osm(OSM::API.new.xml_root_attributes) do |osm|
+  osm << (render(:partial => "bounds", :object => @bounds) || "")
+  osm << (render(@nodes) || "")
+  osm << (render(@ways) || "")
+  osm << (render(@relations) || "")
</pre>
<p>Documentation <a href="https://guides.rubyonrails.org/layouts_and_rendering.html" rel="nofollow">https://guides.rubyonrails.org/layouts_and_rendering.html</a> says:</p>
<blockquote>
<p>In the event that the collection is empty, render will return nil, so it should be fairly simple to provide alternative content.</p>
<pre><code><h1>Products</h1><%= render(@products) || "There are no products available." %>
</code></pre>
</blockquote>

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