Fix crash when filtering for “dormant” relationships (#27306)

spec/fabricators/account_stat_fabricator.rb

@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 Fabricator(:account_stat) do
-  account         nil
-  statuses_count  ""
-  following_count ""
-  followers_count ""
+  account { Fabricate.build(:account) }
+  statuses_count  '123'
+  following_count '456'
+  followers_count '789'
 end