You could listen for map "addoverlay" events.
The awkward thing is working out the timing. There's be one "addoverlay"
for the GGeoXml call itself. I guess that if you only see one such event
between issuing the addOverlay(ggeoxml) call and receiving its
completion callback, then there were no contents. You'd need to
experiment a bit to see if that's exactly what happens.
If the KML generator script is in the same domain, you could
GDownloadUrl it and count the <Placemark>s.
if (xmlDoc.documentElement.getElementsByTagName("Placemark").length==0)
That's a bit inefficient because the KML gets fetched twice, once to the
Google server and once to the browser.
--
Mike Williams
http://econym.org.uk/gmap
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