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Definition

rsvp_attendee_form_validate($form_id, $edit)
rsvp/rsvp.module, line 633

Code

<?php
function rsvp_attendee_form_validate($form_id, $edit) {
  if (!strlen(preg_replace('/\s+/', '', $edit['invite_list']))) {
    drupal_set_message(t('Attendees list is empty.'), 'error');
  }
}
?>