Initial CE backport for saved issue board

app/helpers/boards_helper.rb

@@ -21,13 +21,8 @@ module BoardsHelper
   end
 
   def current_board_json
-    board = @board || @boards.first
-
     board.to_json(
-      only: [:id, :name, :milestone_id],
-      include: {
-        milestone: { only: [:title] }
-      }
+      only: [:id, :name, :milestone_id]
     )
   end