warning: array_merge() in update.php

Issue Summary

Hi,

I tested this module a bit on on Drupal 5.9. I successfully set up a backup directory, found mysqldump and gzip for operation and modified my virtualhost settings to adjust open_basedir and switch off the safemode. I was able to take all my three test sites offline at once and for testing I uploaded newer version of one module.

Update.php run for all three sites was a success as well but at the end of the whole process I got this:

    * warning: array_merge() [function.array-merge]: Argument #2 is not an array in /usr/share/drupal5/update.php on line 309.

It tracks back to this line of code:

in update_data function. It was one of this line per site.

Is this harmful in any way? I brought the sites back online and noticed nothing weird so far but still...