fix part two to #703 - dont try to erase a null geometry

git-svn-id: http://svn.openlayers.org/trunk/openlayers@3155 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Vector.js

@@ -246,7 +246,9 @@ OpenLayers.Layer.Vector.prototype =
             var feature = features[i];
             this.features = OpenLayers.Util.removeItem(this.features, feature);
 
+            if (feature.geometry) {
                 this.renderer.eraseGeometry(feature.geometry);
+            }
                     
             //in the case that this feature is one of the selected features, 
             // remove it from that array as well.