In the openId module when drupal_validate_form('user_register', $form, $form_state); and content profile registration is enabled $form_state['values'] is filled with an empty key, which is a result of calling date_element_empty().

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amitaibu’s picture

amitaibu
Primary language Hebrew
Location Israel
commented

Just to explain a bit more. The empty key then kills user_save() in drupal_unpack().