Move rescue to bottom of file

ee/app/graphql/mutations/incident_management/oncall_rotation/create.rb

@@ -45,7 +45,6 @@ module Mutations
 
           raise_schedule_not_found unless schedule
 
-          begin
           result = ::IncidentManagement::OncallRotations::CreateService.new(
             schedule,
             project,
@@ -53,13 +52,12 @@ module Mutations
             create_service_params(schedule, participants, args)
           ).execute
 
+          response(result)
+
         rescue ActiveRecord::RecordInvalid => e
           raise Gitlab::Graphql::Errors::ArgumentError, e.message
         end
 
-          response(result)
-        end
-
         private
 
         def create_service_params(schedule, participants, args)