fix: Fix filtering in the default theme

Author: davedoesdev

src/default_theme/assets/site.js

@@ -30,7 +30,8 @@ document.getElementById('filter-input').addEventListener('keyup', function(e) {
 
   if (!value.match(/^\s*$/)) {
     match = function(element) {
-      return element.firstChild.innerHTML.toLowerCase().indexOf(value) !== -1;
+      var html = element.firstChild.innerHTML;
+      return html && html.toLowerCase().indexOf(value) !== -1;
     };
   }
 
@@ -83,14 +84,16 @@ function toggleSibling() {
 }
 
 function showHashTarget(targetId) {
-  var hashTarget = document.getElementById(targetId);
-  // new target is hidden
-  if (
-    hashTarget &&
-    hashTarget.offsetHeight === 0 &&
-    hashTarget.parentNode.parentNode.classList.contains('display-none')
-  ) {
-    hashTarget.parentNode.parentNode.classList.remove('display-none');
+  if (targetId) {
+    var hashTarget = document.getElementById(targetId);
+    // new target is hidden
+    if (
+      hashTarget &&
+      hashTarget.offsetHeight === 0 &&
+      hashTarget.parentNode.parentNode.classList.contains('display-none')
+    ) {
+      hashTarget.parentNode.parentNode.classList.remove('display-none');
+    }
   }
 }