Issue #3380283 by larisse: Handle undefined array key in...

Issue #3380283 by larisse: Handle undefined array key in webform_validation_webform_element_configuration_form_alter()

webform_validation.module

@@ -56,7 +56,7 @@ function webform_validation_webform_element_configuration_form_alter(array &$for
   // The title of the current element. This is used to remove the current
   // element from the list of elements to validate relative to. This ought
   // to be done using the element key, but that is not available.
-  $this_element_title = ($customProperties['admin_title'] ?? NULL) ?: $customProperties['title'];
+  $this_element_title = ($customProperties['admin_title'] ?? NULL) ?: ($customProperties['title'] ?? NULL);
   // Array of all elements in the form.
   $elements = $webform->getElementsInitializedAndFlattened();
   foreach ($elements as $elementKey => $element) {