refs #22620 [finc] fix unauthorized link to staff view in toolbar

themes/finc/templates/RecordDriver/DefaultRecord/toolbar.phtml

@@ -20,7 +20,7 @@
     <?php if (count($this->driver->getCitationFormats()) > 0): ?>
       <li><a class="cite-record" data-lightbox href="<?=$this->recordLink()->getActionUrl($this->driver, 'Cite')?>" rel="nofollow"><i class="fa fa-asterisk" aria-hidden="true"></i> <?=$this->transEsc('Cite this')?></a></li>
     <?php endif; ?>
-    <?php if ($this->tabs['Details']
+    <?php if ($this->tabs['Details'] ?? false
         && $this->config()->get('config')->Site->showStaffViewInLightbox ?? false): ?>
       <li>
         <a href="<?=$this->recordLink()->getTabUrl($this->driver, 'Details')?>"