inReplyTo can be empty

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

lib/service/activity_pub/utils.ex

@@ -146,6 +146,8 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
       }
 
       # We fetch the parent object
+      unless !Map.has_key?("inReplyTo") || object_data["inReplyTo"] == nil ||
+               object_data["inReplyTo"] == "" do
         data =
           case ActivityPub.fetch_object_from_url(object_data["inReplyTo"]) do
             # Reply to an event (Comment)
@@ -162,6 +164,7 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
             _ ->
               data
           end
+      end
 
       require Logger
       Logger.info("comment data ready to be inserted")