Fix improper NULL handling in list partitioning code.

Robert Haas <rhaas@postgresql.org>

Commit: 7ecb7143589f38d679bb566311dfa9be1a650fd5
Author: Robert Haas <rhaas@postgresql.org>
Date: 2017-03-27T14:51:46Z
Releases: 10.0
Fix improper NULL handling in list partitioning code.

The previous logic was wrong when the value was NULL but there was
no partition for NULL.

Amit Langote, reviewed by Jeevan Ladhe

Discussion: http://postgr.es/m/d64f8498-70eb-3c88-b56d-c54fd3b0500f@lab.ntt.co.jp

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