Issue #3323272 by bluegeek9, markdorison: DomPDF settings

Closes #3323272

src/Form/DompdfSettingsForm.php

@@ -142,7 +142,7 @@ class DompdfSettingsForm extends ConfigFormBase {
     $chroot = [];
     if ($form_state->hasValue('chroot')) {
       $chroot = $form_state->getValue('chroot');
-      $chroot = $chroot['directories'] ?? [];
+      $chroot = $chroot['directories'] ?? ['.'];
     }
     else {
       $chroot = $settings->get('chroot') ?? ['.'];