Merge branch 'show_frontends_also_when_no_static_frontends_folder_is_created_yet' into 'develop'

List available frontends also when no static/frontends folder is present yet

Closes admin-fe#201

See merge request pleroma/pleroma!3510

lib/pleroma/web/admin_api/controllers/frontend_controller.ex

@@ -35,6 +35,12 @@ defmodule Pleroma.Web.AdminAPI.FrontendController do
   end
 
   defp installed do
-    File.ls!(Pleroma.Frontend.dir())
+    frontend_directory = Pleroma.Frontend.dir()
+
+    if File.exists?(frontend_directory) do
+      File.ls!(frontend_directory)
+    else
+      []
+    end
   end
 end