fix: ignore subgroups without link when checking for permission (#10690)

app/javascript/dashboard/components-next/sidebar/SidebarGroup.vue

@@ -40,7 +40,12 @@ const hasChildren = computed(
 
 const accessibleItems = computed(() => {
   if (!hasChildren.value) return [];
-  return props.children.filter(child => isAllowed(child.to));
+  return props.children.filter(child => {
+    // If a item has no link, it means it's just a subgroup header
+    // So we don't need to check for permissions here, because there's nothing to
+    // access here anyway
+    return child.to && isAllowed(child.to);
+  });
 });
 
 const hasAccessibleChildren = computed(() => {