Return prefers not to say labels

app/models/form/lettings/questions/nationality_all.rb

@@ -18,6 +18,7 @@ class Form::Lettings::Questions::NationalityAll < ::Form::Question
 
   def label_from_value(value)
     return unless value
+    return "Tenant prefers not to say" if value.to_i.zero?
 
     answer_options[value.to_s]["name"]
   end

app/models/form/sales/questions/nationality_all.rb

@@ -24,6 +24,7 @@ class Form::Sales::Questions::NationalityAll < ::Form::Question
 
   def label_from_value(value)
     return unless value
+    return "Buyer prefers not to say" if value.to_i.zero?
 
     answer_options[value.to_s]["name"]
   end