TwitterAPI: Add unimplemented /friendships/no_retweets/ids.

lib/pleroma/web/router.ex

@@ -190,6 +190,7 @@ defmodule Pleroma.Web.Router do
     get "/statuses/followers", TwitterAPI.Controller, :followers
     get "/statuses/friends", TwitterAPI.Controller, :friends
     get "/friends/ids", TwitterAPI.Controller, :friends_ids
+    get "/friendships/no_retweets/ids", TwitterAPI.Controller, :empty_array
 
     get "/externalprofile/show", TwitterAPI.Controller, :external_profile
   end

lib/pleroma/web/twitter_api/twitter_api_controller.ex

@@ -270,12 +270,16 @@ defmodule Pleroma.Web.TwitterAPI.Controller do
       ids = friends
       |> Enum.map(fn x -> x.id end)
       |> Poison.encode!
+
       json(conn, ids)
     else
       _e -> bad_request_reply(conn, "Can't get friends")
     end
   end
 
+  def empty_array(conn, _params) do
+    json(conn, Poison.encode!([]))
+  end
 
   def update_profile(%{assigns: %{user: user}} = conn, params) do
     params = if bio = params["description"] do