Actually put some onformation in the error user, make it actually properly parse

in conversations.

lib/pleroma/web/twitter_api/views/activity_view.ex

@@ -101,12 +101,14 @@ defmodule Pleroma.Web.TwitterAPI.ActivityView do
         user
 
       true ->
-        error_user()
+        error_user(ap_id)
     end
   end
 
-  defp error_user do
+  defp error_user(ap_id) do
     %User{
+      name: ap_id,
+      ap_id: ap_id,
       info: %User.Info{},
       nickname: "erroruser@example.com",
       inserted_at: NaiveDateTime.utc_now()