Hide order selectors when only one order available

app/views/shared/_order_selector.html.erb

@@ -1,3 +1,4 @@
+<% if @valid_orders.present? && @valid_orders.count > 1 %>
   <form class="inline-block">
     <label for="order-selector-participation" class="show-for-sr"><%= t("#{i18n_namespace}.select_order") %></label>
     <select class="js-location-changer js-order-selector select-order"
@@ -12,3 +13,4 @@
        <% end %>
      </select>
   </form>
+<% end %>

app/views/shared/_wide_order_selector.html.erb

@@ -2,7 +2,7 @@
    #
    #   i18n_namespace: for example "moderation.debates.index"
 %>
-
+<% if @valid_orders.present? && @valid_orders.count > 1 %>
   <div class="wide-order-selector small-12 medium-8">
     <form>
       <div class="small-12 medium-6 float-left">
@@ -24,3 +24,4 @@
       </div>
     </form>
   </div>
+<% end %>