changes, rather than trying to set it to 17, which will fail, and leave the zoom level as null, and then everything explodes. Thanks to Heidi Fox at MC for this report. git-svn-id: http://svn.openlayers.org/branches/openlayers/2.0@1355 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf