Add saveguard not to include 0 in a scale for logarithmic axes Including 0 or allowing negative values triggers a bug in the jfreechart logarithmic axis code that causes values < 1 to be drawn in carthesic coordinates. Fixes: flys/issue12345

#!/bin/bash

bin_dir=`dirname $0`
bin_dir=`readlink -f $bin_dir`
exec java \
    -Dlog4j.configuration=file://$bin_dir/log4j.properties \
    -Dconfig.file=$bin_dir/../doc/conf-oracle.xml \
    -jar $bin_dir/etl.jar