Fix: Typo and error in webform module

modules/dashboards_webform/src/Plugin/Dashboard/Submissions.php

@@ -63,12 +63,15 @@ class Submissions extends DashboardBase {
    * {@inheritdoc}
    */
   public function buildSettingsForm(array $form, FormStateInterface $form_state, array $configuration): array {
-    $webform = $this->entityTypeManager->getStorage('webform')->load($configuration['webform']);
+    $webform = FALSE;
+    if (!empty($configuration['webform'])) {
+      $webform = $this->entityTypeManager->getStorage('webform')->load($configuration['webform']);
+    }
     $form['webform'] = [
       '#type' => 'entity_autocomplete',
       '#target_type' => 'webform',
       '#selection_handler' => 'default',
-      '#default_value' => ($webform) ? $webform : NULL,
+      '#default_value' => $webform,
     ];
     $form['period'] = [
       '#type' => 'select',