DIA_PLUGIN_PATH, XSLT plug-in, and File (of diagram)->Export

[Andrew S Halper <ashalper acm org>]

Since the addition of the XSLT plug-in (thanks very much for this BTW), 
on my system, if DIA_PLUGIN_PATH is not set, File (of  diagram)->Export 
segfaults (I suspect due to the XSLT export filter not being loaded 
somewhere in filter.c?).  This seems ungood to me.  Is it me, or can 
anyone else duplicate this?

Thanks,
Andy