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

<?xml version="1.0" encoding="UTF-8" ?>
<rest-server>
    <!--  The port which the ArtifactDatabase (ArtifactServer) will bind to. -->
    <port>8181</port>
    <listen>localhost</listen>
</rest-server>