Improve AP error handling

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/federation/activity_pub/activity_pub.ex

@@ -101,6 +101,10 @@ defmodule Mobilizon.Federation.ActivityPub do
       {:existing, entity} ->
         handle_existing_entity(url, entity, options)
 
+      {:error, e} ->
+        Logger.warn("Something failed while fetching url #{inspect(e)}")
+        {:error, e}
+
       e ->
         Logger.warn("Something failed while fetching url #{inspect(e)}")
         {:error, e}