remote user deactivation: fix test failures

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -17,10 +17,13 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
   end
 
   defp check_actor_is_active(actor) do
-    user = User.get_cached_by_ap_id(actor)
-
-    if user.info["deactivated"] == true do
-      :reject
+    if not is_nil(actor) do
+      with user <- User.get_cached_by_ap_id(actor),
+           nil <- user.info["deactivated"] do
+        :ok
+      else
+        _e -> :reject
+      end
     else
       :ok
     end