Issue #3220258 by Xiaohua Guan, yas: Fix TypeError:...

Issue #3220258 by Xiaohua Guan, yas: Fix TypeError: Drupal\k8s\Entity\K8sDeployment::getCreationYaml()

Closes #3220258

modules/cloud_service_providers/k8s/src/Entity/K8sConfigMap.php

@@ -86,7 +86,7 @@ class K8sConfigMap extends K8sEntityBase implements K8sConfigMapInterface {
    * {@inheritdoc}
    */
   public function getCreationYaml(): string {
-    return $this->get('creation_yaml')->value;
+    return $this->get('creation_yaml')->value ?? '';
   }
 
   /**