fix: No auth was not working (#551)

Author: jonas-martinez

apps/lenra_web/lib/lenra_web/app_adapter.ex

@@ -15,14 +15,20 @@ defmodule LenraWeb.AppAdapter do
   @impl ApplicationRunner.Adapter
   def allow(user_id, app_name) do
     with %App{} = application <- get_app(app_name),
-         user <- Accounts.get_user(user_id) do
+         user <- get_user(user_id) do
       Bouncer.allow(LenraWeb.AppAdapter.Policy, :join_app, user, application)
     else
       _err ->
         BusinessError.forbidden_tuple()
     end
   end
 
+  defp get_user(user_id) when is_nil(user_id), do: nil
+
+  defp get_user(user_id) do
+    Accounts.get_user(user_id)
+  end
+
   @impl ApplicationRunner.Adapter
   def get_function_name(app_name) do
     lenra_env = Application.fetch_env!(:lenra, :lenra_env)