Revert 95d737ff to add 'ignore_nulls'

Stephen Frost <sfrost@snowman.net>

Commit: c8a026e4f15e2063cd7fe6cb9ffe44f2a81398bd
Author: Stephen Frost <sfrost@snowman.net>
Date: 2014-09-29T17:32:22Z
Releases: 9.5.0
Revert 95d737ff to add 'ignore_nulls'

Per discussion, revert the commit which added 'ignore_nulls' to
row_to_json.  This capability would be better added as an independent
function rather than being bolted on to row_to_json.  Additionally,
the implementation didn't address complex JSON objects, and so was
incomplete anyway.

Pointed out by Tom and discussed with Andrew and Robert.

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