pgsql: Suppress bogus statistics when pgbench failed to complete any tr

Suppress bogus statistics when pgbench failed to complete any transactions.

Code added in 9.4 would attempt to divide by zero in such cases.
Noted while testing fix for missing-pclose problem.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/de8e46f5f5785f4016aabf2aa231faa89a0746fb

Modified Files
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contrib/pgbench/pgbench.c | 4 ++++
1 file changed, 4 insertions(+)

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