Supply default value when CloudFlareTimeoutException happens

Closes #3285466

src/Form/SettingsForm.php

@@ -255,7 +255,7 @@ class SettingsForm extends FormBase implements ContainerInjectionInterface {
       '#type' => 'textfield',
       '#title' => $this->t('Current Zone'),
       '#description' => $description,
-      '#default_value' => $zone_text,
+      '#default_value' => $zone_text ?? 'Zone Name Not Found',
       '#disabled' => TRUE,
     ];