Ensure tags menu item works when the list page doesn't exist

website/blog/wagtail_hooks.py

@@ -1,3 +1,4 @@
+from django.http.request import HttpRequest
 from django.urls import reverse
 from wagtail import hooks
 from wagtail.admin.menu import MenuItem
@@ -5,15 +6,28 @@ from wagtail.admin.menu import MenuItem
 from .models import BlogPostTagListPage
 
 
-@hooks.register("register_admin_menu_item")
-def register_blog_post_tags_menu_item() -> MenuItem:
+class BlogPostTagsMenuItem(MenuItem):
+    url: str
+
+    def __init__(self) -> None:
+        super().__init__("Blog post tags", url="", icon_name="tag")
+
+    def is_shown(self, request: HttpRequest) -> bool:
+        if not self.url:
             blog_post_tag_list_id = (
                 BlogPostTagListPage.objects.live()  # type:ignore[attr-defined]
                 .values_list("id", flat=True)
-        .get()
+                .first()
             )
-    return MenuItem(
-        "Blog post tags",
-        reverse("wagtailadmin_explore", args=[blog_post_tag_list_id]),
-        icon_name="tag",
+            self.url = (
+                reverse("wagtailadmin_explore", args=[blog_post_tag_list_id])
+                if blog_post_tag_list_id
+                else ""
             )
+
+        return bool(self.url)
+
+
+@hooks.register("register_admin_menu_item")
+def register_blog_post_tags_menu_item() -> MenuItem:
+    return BlogPostTagsMenuItem()