Add group admin profiles

And other fixes

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

lib/federation/activity_stream/converter/comment.ex

@@ -135,6 +135,7 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Comment do
   def model_to_as(%CommentModel{} = comment) do
     Convertible.model_to_as(%TombstoneModel{
       uri: comment.url,
+      actor: comment.actor,
       inserted_at: comment.deleted_at
     })
   end

lib/federation/activity_stream/converter/discussion.ex

@@ -39,6 +39,7 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Discussion do
       "actor" => discussion.creator.url,
       "attributedTo" => discussion.actor.url,
       "id" => discussion.url,
+      "publishedAt" => discussion.inserted_at,
       "context" => discussion.url
     }
   end

lib/federation/activity_stream/converter/tombstone.ex

@@ -28,7 +28,7 @@ defmodule Mobilizon.Federation.ActivityStream.Converter.Tombstone do
     %{
       "type" => "Tombstone",
       "id" => tombstone.uri,
-      "actor" => tombstone.actor.url,
+      "actor" => if(tombstone.actor, do: tombstone.actor.url, else: nil),
       "deleted" => tombstone.inserted_at
     }
   end