If valid geometry specified on command line, use it for both streams.  This change helps make the scripts/htdocs-gen_plot-examples.sh script work properly to generate the 14th example pages.
If valid geometry specified on command line, use it for both streams.  This
change helps make the scripts/htdocs-gen_plot-examples.sh script work properly
to generate the 14th example pages.

svn path=/trunk/; revision=9397

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot