Error messages for nodes with no abstract.

I was getting numerous error messages in the log like:

notice: Trying to get property of non-object in epublish_nodeapi() (line 476 of /var/www/multimedia/sefueronlejos/Drupal/sites/all/modules/epublish/epublish.module).

This happens when the node doesn't have content in the an epublish_abstract field. Adding line 476:

if (!$object) {$object->epublish_abstract='';}

eliminates the errors.

Attached patch should correct.