pgbench: fix segfault with empty sql file

Commit 1d0c3b3f8a introduced a bug that causes pgbench to crash if an
empty script file is specified.  Fix it by rejecting such files at
startup, which is the historical and intended behavior.

Reported-By: Jeff Janes
Discussion: 
https://www.postgresql.org/message-id/CAMkU=1zxKUbLPOt9hQWFp14pTc=v0cgo2gqbbn2gsk2pu+8...@mail.gmail.com

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/db94419ffd6833da27176f6cca843483b4515065

Modified Files
--------------
src/bin/pgbench/pgbench.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)


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