Improve error messages for missing-FROM-entry cases, as per recent discussion.

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

Commit: db55a807debc71982d8a12b712ac040e052fd1bc
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2006-01-10T22:00:07Z
Releases: 8.1.3
Improve error messages for missing-FROM-entry cases, as per recent discussion.

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