Add extra check

Author: patrykkopycinski

x-pack/legacy/plugins/siem/server/lib/detection_engine/rules/update_rules.ts

@@ -92,7 +92,7 @@ export const updateRules = async ({
       tags: addTags(tags, rule.params.ruleId, immutable),
       name,
       schedule: { interval },
-      actions: actions.map(transformRuleToAlertAction) ?? rule.actions,
+      actions: actions?.map(transformRuleToAlertAction) ?? rule.actions,
       throttle: throttle !== undefined ? throttle : rule.throttle,
       params: {
         description,