Add an optional missing_ok argument to SQL function current_setting().

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

Commit: 10fb48d66de76e7dc1e36ef18af502ed9600352f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2015-07-02T20:41:07Z
Releases: 9.6.0
Add an optional missing_ok argument to SQL function current_setting().

This allows convenient checking for existence of a GUC from SQL, which is
particularly useful when dealing with custom variables.

David Christensen, reviewed by Jeevan Chalke

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