pgsql: Fix possible failure to send final transaction counts to stats c

Fix possible failure to send final transaction counts to stats collector.

Normally, we suppress sending a tabstats message to the collector unless
there were some actual table stats to send. However, during backend exit
we should force out the message if there are any transaction commit/abort
counts to send, else the session's last few commit/abort counts will never
get reported at all. We had logic for this, but the short-circuit test
at the top of pgstat_report_stat() ignored the "force" flag, with the
consequence that session-ending transactions that touched no database-local
tables would not get counted. Seems to be an oversight in my commit
641912b4d17fd214a5e5bae4e7bb9ddbc28b144b, which added the "force" flag.
That was back in 8.3, so back-patch to all supported versions.

Branch
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REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/d6f9b2cac36da23373946ff382db0e6217c813a1

Modified Files
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src/backend/postmaster/pgstat.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)