fix: use Enum.empty? instead of != [] to fix type warning

Replace comparison with empty list using Enum.empty?/1 to satisfy
type checker and avoid redundant comparison warning

test/mv/authorization/permission_sets_test.exs

@@ -74,7 +74,7 @@ defmodule Mv.Authorization.PermissionSetsTest do
       for set <- [:own_data, :read_only, :normal_user, :admin] do
         permissions = PermissionSets.get_permissions(set)
 
-        assert permissions.pages != [],
+        assert not Enum.empty?(permissions.pages),
                "Permission set #{set} should have at least one page"
       end
     end