Merge pull request #5542 from nhsuk/continue-set-disease-types

Allow `set_disease_types` to continue from where it left off

Author: thomasleese

lib/tasks/data_migration.rake

@@ -10,6 +10,7 @@ namespace :data_migration do
   task set_disease_types: :environment do
     VaccinationRecord
       .includes(:vaccine)
+      .where(disease_types: nil)
       .find_each do |vaccination_record|
         disease_types =
           vaccination_record.vaccine&.disease_types ||