Fix crash when trying to display a NOTIFY rule action.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 403bd6a18b8ec5aeee51c08360441c3c3c239d8f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2013-05-16T20:47:26Z
Releases: 9.3.0
Fix crash when trying to display a NOTIFY rule action.

Fixes oversight in commit 2ffa740be9d96a3743ecb7e42391c53d0760c65a.
Per report from Josh Kupershmidt.

I think we've broken this case before, so let's add a regression test
this time.

Files