iso_options_for_select does not return correct options if called directly

[lluis]

Hi,
I'm trying to call iso_options_for_select to wrap it into a select, but it doesn't return what expected.
In a debugger, on a view:
(rdb:3) iso_options_for_select "<option value=\"dz\"></option>" (rdb:3) iso_options_for_select("es",[:es]) "<option value=\"es\" selected=\"selected\"></option><option value=\"\">-------------</option>\n<option value=\"dz\"></option>"

greetings,
Lluís