Fix poll messages crashing

app/controllers/repp/v1/registrar/summary_controller.rb

@@ -59,6 +59,7 @@ def notification_object(notification)
           # WHERE attached_obj_type = 'Epp::Domain' AND name IS NULL;
           message = 'orphan message, domain deleted, registrar should dequeue: '
           Rails.logger.error message + e.to_s
+          nil
         end
         # rubocop:enable Style/RescueStandardError
 

app/models/action.rb

@@ -3,6 +3,7 @@ class Action < ApplicationRecord
 
   belongs_to :user
   belongs_to :contact, optional: true
+  has_many :notifications, dependent: :nullify
   has_many :subactions, class_name: 'Action',
                         foreign_key: 'bulk_action_id',
                         inverse_of: :bulk_action,

app/models/notification.rb

@@ -13,6 +13,7 @@ class Notification < ApplicationRecord
 
   def mark_as_read
     raise 'Read notification cannot be marked as read again' if read?
+
     self.read = true
     save
   end