A warning and A fix

hi rjerome,
A warning
When I submit a biblio node and give some keywords,it is ok. But when I edit it,there is a warning,like this warning: Invalid argument supplied for foreach() in .../modules/biblio/biblio.module on line 963.
If when I submit it ,empty the keywords line , there is not warning.I check this line code ,it doesn't like old version.Comaprison 959-969 lines in biblio.module with rc5v and the old,it looks different.
RC5 version:

        if ($key == 'biblio_keywords' ) {
          $sep = variable_get('biblio_keyword_sep', ',');
          $keywords = '';
          if (!empty($node->$key)) {
            foreach ($node->$key as $keyword) {
              $keywords .= (empty($keywords)?$keyword->word:"$sep " . $keyword->word);
            }
          }
          $node->$key = $keywords;
          $fld['hint'] = t('Separate keywords using the " @sep " character', array('@sep' => $sep));
        } 

Old version:

        if ($key == 'biblio_keywords' ) {
          $sep = variable_get('biblio_keyword_sep', ',');
          if (!empty($node->$key)) {
            foreach ($node->$key as $keyword) {
              $keywords .= (empty($keywords)?$keyword->word:"$sep " . $keyword->word);
            }
          $node->$key = $keywords;
          }

          $fld['hint'] = t('Separate keywords using the " @sep " character', array('@sep' => $sep));
        } 

Could you tell me where is wrong?

A fix
On mysite/biblio/authors page,when you click the edit link behind every author, Url is not correct.It looks like "mysite/1/edit",but right url is "mysite/biblio/author/1/edit".So 1011 line in biblio.pages.inc of RC5, return l(' ['.t('edit').']', "$path" . $author['cid'] ."/edit/" ); should be return l(' ['.t('edit').']', "$path/author/" . $author['cid'] ."/edit/" );