these should never be called if no baselayer is set... but one never knows what a user will do. So instead of crashing, we will just return null. git-svn-id: http://svn.openlayers.org/trunk/openlayers@857 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
these should never be called if no baselayer is set... but one never knows what a user will do. So instead of crashing, we will just return null. git-svn-id: http://svn.openlayers.org/trunk/openlayers@857 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf