Patch to allow contrib/pgbench files to have blank lines

Folks,

Having blank lines in -f scripts was causing silent failures.  This
fixes it, for some value of "fixes."  If it's OK, please apply to 8.1
CURRENT and CVS TIP :)

Cheers,
D
--
David Fetter david@fetter.org http://fetter.org/
phone: +1 415 235 3778

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