!user_uri erroneus when used in self-created nodes response message.

In line 415 of comment_notify.module it erroneusly uses $alert->uid when $alert has not been populated.
It can be corrected using the real UID from the node creator that is the UID of the addressee to be notified.

so changing:
line 415: '!edit_uri' => url('user/'. $alert->uid .'/edit', array('absolute' => TRUE))
to:
line 415 '!edit_uri' => url('user/'. $node->uid .'/edit', array('absolute' => TRUE))

fix the issue.