fixed nil issue

app/controllers/curations_controller.rb

@@ -730,12 +730,14 @@ class CurationsController < ApplicationController
         }
       end
     end
+    sections.compact!
 
     if !announcement.deadline.nil? && announcement.deadline < Time.now
       return {
       "tags" => [],
       "bulletin_files" => [],
       "bulletin_links" => [],
+      "sections" => sections,
       "data" => {
         "title" => announcement.title,
         "subtitle_ann" => '',