CLDC-4034: TEST throw RecordInvalid on merge

app/services/merge/merge_organisations_service.rb

@@ -8,6 +8,8 @@ class Merge::MergeOrganisationsService
 
   def call
     ActiveRecord::Base.transaction do
+      raise ActiveRecord::RecordInvalid
+
       @merged_users = {}
       @merged_schemes = {}
       merge_organisation_details