Replace a workaround with a more semantic one. - In old implementation, it has not clear intention in the syntax. - I move the line doing real works into the try-except block to emphasize the intention of skipping scene nodes that is incomplete.

#!/bin/sh
cp inkscape.js madbuilder.html *.png jq*.js /home/wycc/.mozilla/firefox/tmkakd0b.devel/extensions/madswatter@madswatter.branda.to/content/
cp MBServer.py /usr/local/share/inkscape/extensions
cp helper_mb.py /usr/bin