[refactor] Clean up unused code

app/controllers/ticket_purchases_controller.rb

@@ -41,15 +41,15 @@ class TicketPurchasesController < ApplicationController
     if @conference.registration_ticket_required? && count_registration_tickets_after == 0
       redirect_to conference_tickets_path(@conference.short_title),
               error: 'Please get at least one registration ticket to continue.'
-      return   
+      return
     end
 
     # Current user didn't have a registration ticket and is purchasing one
     if count_registration_tickets_before == 0 && count_registration_tickets_after == 1
       redirect_to new_conference_conference_registration_path(@conference.short_title)
-    else 
+    else
       redirect_to conference_physical_tickets_path
-    end    
+    end
   end
 
   def index

app/models/ticket_purchase.rb

@@ -110,11 +110,6 @@ class TicketPurchase < ApplicationRecord
       errors.add(:quantity, 'cannot be greater than one for registration tickets.')
     end
   end
-
-  # def has_registration_ticket_for?(conference)
-  #   # BUG: ticket_purchase has only one ticket?
-  #   ticket.try(:registration_ticket?)
-  # end
 end
 
 private