pgsql: Consistently set all fields in pg_stat_replication to null inste

Consistently set all fields in pg_stat_replication to null instead of 0

Previously the "sent" field would be set to 0 and all other xlog
pointers be set to NULL if there were no valid values (such as when
in a backup sending walsender).

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/28c366789e78af82dfd89ecb6cc32724f58d6a1b

Modified Files
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src/backend/replication/walsender.c | 3 +++
1 file changed, 3 insertions(+)

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