Add no merge requests message

app/views/organisations/_merge_request_list.html.erb

@@ -1,4 +1,7 @@
 <section class="app-table-group" tabindex="0" aria-labelledby="<%= title.dasherize %>">
+  <% if @merge_requests.empty? %>
+    <p>No merge requests</p>
+  <% else %>
   <%= govuk_table do |table| %>
     <%= table.with_caption(classes: %w[govuk-!-font-size-19 govuk-!-font-weight-regular]) do |caption| %>
       <strong><%= @merge_requests.where.not(status: 4).count %></strong> unresolved merge requests
@@ -51,4 +54,5 @@
         <% end %>
       <% end %>
     <% end %>
+  <% end %>
 </section>