Add error response on empty status

lib/pleroma/web/twitter_api/twitter_api_controller.ex

@@ -12,13 +12,25 @@ defmodule Pleroma.Web.TwitterAPI.Controller do
     |> json_reply(200, response)
   end
 
-  def status_update(%{assigns: %{user: user}} = conn, status_data) do
+  def status_update(conn, %{"status" => ""} = _status_data) do
+    empty_status_reply(conn)
+  end
+
+  def status_update(%{assigns: %{user: user}} = conn, %{"status" => _status_text} = status_data) do
     media_ids = extract_media_ids(status_data)
     {:ok, activity} = TwitterAPI.create_status(user, Map.put(status_data, "media_ids",  media_ids ))
     conn
     |> json_reply(200, ActivityRepresenter.to_json(activity, %{user: user}))
   end
 
+  def status_update(conn, _status_data) do
+    empty_status_reply(conn)
+  end
+
+  defp empty_status_reply(conn) do
+    bad_request_reply(conn, "Client must provide a 'status' parameter with a value.")
+  end
+
   defp extract_media_ids(status_data) do
     with media_ids when not is_nil(media_ids) <- status_data["media_ids"],
          split_ids <- String.split(media_ids, ","),
@@ -183,7 +195,7 @@ defmodule Pleroma.Web.TwitterAPI.Controller do
   end
 
   defp bad_request_reply(conn, error_message) do
-    json = Poison.encode!(%{"error" => error_message})
+    json = error_json(conn, error_message)
     json_reply(conn, 400, json)
   end
 
@@ -194,9 +206,11 @@ defmodule Pleroma.Web.TwitterAPI.Controller do
   end
 
   defp forbidden_json_reply(conn, error_message) do
-    json = %{"error" => error_message, "request" => conn.request_path}
-    |> Poison.encode!
-
+    json = error_json(conn, error_message)
     json_reply(conn, 403, json)
   end
+
+  defp error_json(conn, error_message) do
+    %{"error" => error_message, "request" => conn.request_path} |> Poison.encode!
+  end
 end