Loading deleted object causes critical internal error

[flack]

To reproduce:

$t = new midgard_topic();
$t->create();
$t->delete();
$t = new midgard_topic($t->id);
echo midgard_connection::get_instance()->get_error_string();

Expected result:

"Object does not exist."

Actual result:

Fatal error: Uncaught exception 'midgard_error_exception' with message 'Critical internal error.Object doesn't exist'

[flack]

Also, the error code is wrong, it says MGD_ERR_INTERNAL, but it should be MGD_ERR_NOT_EXISTS