[5.2.x] Fixed #36114 -- Fixed link visibility when list_display_links field contains only whitespace.

Backport of e262d5355d82901f81fba6c7015643c2b87125bf from main.

django/contrib/admin/templatetags/admin_list.py

@@ -223,6 +223,8 @@ def items_for_result(cl, result, form):
             empty_value_display = getattr(
                 attr, "empty_value_display", empty_value_display
             )
+            if isinstance(value, str) and value.strip() == "":
+                value = ""
             if f is None or f.auto_created:
                 if field_name == "action_checkbox":
                     row_classes = ["action-checkbox"]

tests/admin_changelist/tests.py

@@ -1076,6 +1076,17 @@ class ChangeListTests(TestCase):
             "http://blues_history.com</a>" % g.pk,
         )
 
+    def test_blank_str_display_links(self):
+        self.client.force_login(self.superuser)
+        gc = GrandChild.objects.create(name="          ")
+        response = self.client.get(
+            reverse("admin:admin_changelist_grandchild_changelist")
+        )
+        self.assertContains(
+            response,
+            '<a href="/admin/admin_changelist/grandchild/%s/change/">-</a>' % gc.pk,
+        )
+
     def test_clear_all_filters_link(self):
         self.client.force_login(self.superuser)
         url = reverse("admin:auth_user_changelist")