Fix NULL input behaviour of pg_stat_get_replication_slot().

Andres Freund <andres@anarazel.de>

Commit: c1a0d7d1c4b77d978fe93edc0889589148cbad23
Author: Andres Freund <andres@anarazel.de>
Date: 2022-03-28T04:44:39Z
Releases: 14.3
Fix NULL input behaviour of pg_stat_get_replication_slot().

pg_stat_get_replication_slot() accidentally was marked as non-strict, crashing
when called with NULL input. As it's already released, introduce an explicit
NULL check in 14, fix the catalog in HEAD.

Bumps catversion in HEAD.

Discussion: https://postgr.es/m/20220326212432.s5n2maw6kugnpyxw@alap3.anarazel.de
Backpatch: 14-, where replication slot stats were introduced

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