refs #16196 [fid_adlr] issn online-contents adlr.link

* fixed doi

themes/fid_adlr/templates/get-it-box/links.phtml

@@ -32,7 +32,9 @@
               <span id="urlsHideable" style="display: none">
           <?php foreach ($fallbackUrls as $current): ?>
             <?php if (preg_match_all('/doi/', $current['url'])): ?>
-            <a href="<?=$this->escapeHtmlAttr($this->proxyUrl($current['url']))?>" target="_blank">DOI: <?=$doiName?></a>
+            <a href="<?=$this->escapeHtmlAttr($this->proxyUrl($current['url']))?>" target="_blank">
+              DOI: <?=!empty($doiName) ? $doiName : $current['url'] ?>
+            </a>
             <?php endif; ?>
           <?php endforeach; ?>
         </span>