Fix poll messages crashing

[maricavor]

• Close Poll message crashes portal  registrar_center2#130
• Repp::V1::Registrar::SummaryController -> Added a return of nil after logging the error, ensuring the method returns a consistent value after an exception is caught.
• Created missing has_many relationship between the Action model and a Notification model. When an associated Action is deleted, the notifications related to it will have their foreign key set to null instead of being deleted, preserving the notifications while breaking the association.