Fix more user-visible elog() calls.

Robert Haas <rhaas@postgresql.org>

Commit: 9d742e19da22aca5f872ccb07b1b8abe78de23dd
Author: Robert Haas <rhaas@postgresql.org>
Date: 2017-10-05T12:03:04Z
Releases: 9.6.6
Fix more user-visible elog() calls.

Michael Paquier discovered that this could be triggered via SQL;
give a nicer message instead.

Patch by Michael Paquier, reviewed by Masahiko Sawada.

Discussion: http://postgr.es/m/CAB7nPqQtPg+LKKtzdKN26judHcvPZ0s1gNigzOT4j8CYuuuBYg@mail.gmail.com

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