Remove sidebar when conference has no components (decidim#12849)

* add conditional render for layouts

* pass rubocop

* adjust column size

* add title to conference spec check

* remove title from spec

* refactor adding a variable

decidim-conferences/app/views/decidim/conferences/conferences/show.html.erb

@@ -37,7 +37,8 @@ edit_link(
 
   <%= render partial: "conference_hero" %>
 
-  <%= render layout: "layouts/decidim/shared/layout_two_col", locals: { reverse: true, main_enabled: false } do %>
+  <% layout_style = conference_nav_items(current_participatory_space).any? ? "layout_two_col" : "layout_center" %>
+  <%= render layout: "layouts/decidim/shared/#{layout_style}", locals: { reverse: true, main_enabled: false, columns: 10 } do %>
 
     <%= participatory_space_floating_help %>
 

decidim-conferences/spec/system/conferences_spec.rb

@@ -141,6 +141,10 @@
       visit decidim_conferences.conference_path(conference)
     end
 
+    it "has a sidebar" do
+      expect(page).to have_css(".conference__nav-container")
+    end
+
     describe "follow button" do
       let!(:user) { create(:user, :confirmed, organization:) }
       let(:followable) { conference }
@@ -267,4 +271,16 @@
       end
     end
   end
+
+  describe "when the conference has no components" do
+    let!(:conference) { base_conference }
+
+    before do
+      visit decidim_conferences.conference_path(conference)
+    end
+
+    it "has no sidebar" do
+      expect(page).to have_no_css(".conference__nav-container")
+    end
+  end
 end