fix(integrations): Fix creating a deleted customer (#2265)

## Context

We were getting a lot of dead jobs when trying to sync a deleted
customer to nango (netsuite).

## Description

This PR fixes the issue by not trying to sync a non-existent (deleted)
customer.

app/services/integration_customers/create_or_update_service.rb

@@ -11,7 +11,7 @@ def initialize(integration_customers:, customer:, new_customer:)
  end
 
  def call
- return if integration_customers.nil?
+ return if integration_customers.nil? || customer.nil?
 
  sanitize_integration_customers
 

spec/services/integration_customers/create_or_update_service_spec.rb

@@ -38,6 +38,22 @@
  end
  end
 
+ context 'without customer' do
+ let(:integration_code) { integration.code }
+ let(:sync_with_provider) { true }
+ let(:external_customer_id) { nil }
+ let(:new_customer) { true }
+ let(:customer) { nil }
+
+ it 'does not call create job' do
+ expect { service_call }.not_to have_enqueued_job(IntegrationCustomers::CreateJob)
+ end
+
+ it 'does not call update job' do
+ expect { service_call }.not_to have_enqueued_job(IntegrationCustomers::UpdateJob)
+ end
+ end
+
  context 'without external fields set' do
  let(:integration_code) { integration.code }
  let(:sync_with_provider) { false }