Sort stages alphabetically in manage, highlight blank stage names

• Sort stages alphabetically in conference stage selection view
• Add visual indicator for stages with blank names

app/controllers/admin/conferences_controller.rb

@@ -65,7 +65,7 @@ module Admin
     end
 
     def select_relevant_stages
-      @stages = @conference.stages
+      @stages = @conference.stages.order(:name)
     end
 
     def update_relevant_stages
@@ -74,7 +74,7 @@ module Admin
       if @conference.save
         redirect_to admin_conferences_path, notice: "Relevant stages updated successfully."
       else
-        @stages = @conference.stages
+        @stages = @conference.stages.order(:name)
         render :select_relevant_stages
       end
     end