Update NodeTitleValidationAdminForm.php for removing error: Call to a member...
requested to merge issue/node_title_validation-3414294:3414294-Submitting-form-throws-error into 8.x-1.x
Update NodeTitleValidationAdminForm.php for removing error: Call to a member function addMessage() on null in Drupal\node_title_validation\Form\NodeTitleValidationAdminForm->submitForm()
Closes #3414294