set processor_id if it is obvious

CRM/Stripe/Upgrader.php

@@ -68,6 +68,26 @@ class CRM_Stripe_Upgrader extends CRM_Stripe_Upgrader_Base {
       CRM_Core_DAO::executeQuery('ALTER TABLE civicrm_stripe_customers ADD COLUMN `processor_id` int(10) DEFAULT NULL COMMENT "ID from civicrm_payment_processor"');
       CRM_Core_DAO::executeQuery('ALTER TABLE civicrm_stripe_plans ADD COLUMN `processor_id` int(10) DEFAULT NULL COMMENT "ID from civicrm_payment_processor"');
       CRM_Core_DAO::executeQuery('ALTER TABLE civicrm_stripe_subscriptions ADD COLUMN `processor_id` int(10) DEFAULT NULL COMMENT "ID from civicrm_payment_processor"');
+      try {
+        // Set processor ID if there's only one.
+        $processorCount = civicrm_api3('PaymentProcessorType', 'get', array(
+          'name' => "Stripe",
+          'api.PaymentProcessor.getcount' => array('is_test' => 0),
+        ));
+        foreach ($processorCount['values'] as $processorType) {
+          if (!empty($processorType['api.PaymentProcessor.get']['id'])) {
+            $p = array(
+              1 => array($processorType['api.PaymentProcessor.get']['id'], 'Integer'),
+            );
+            CRM_Core_DAO::executeQuery('UPDATE civicrm_stripe_customers SET processor_id = %1 where processor_id IS NULL', $p);
+            CRM_Core_DAO::executeQuery('UPDATE civicrm_stripe_plans SET processor_id = %1 where processor_id IS NULL', $p);
+            CRM_Core_DAO::executeQuery('UPDATE civicrm_stripe_subscriptions SET processor_id = %1 where processor_id IS NULL', $p);
+          }
+        }
+      }
+      catch (CiviCRM_API3_Exception $e) {
+        return TRUE;
+      }
     }
     return TRUE;
   }