When trying to deactivate a control from within that control's featureAdded

event, a null exception is encountered. A null check fixes this bug. (Closes
#1143)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@5433 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Handler/Polygon.js

@@ -65,7 +65,9 @@ OpenLayers.Handler.Polygon = OpenLayers.Class(OpenLayers.Handler.Path, {
      */
     destroyFeature: function() {
         OpenLayers.Handler.Path.prototype.destroyFeature.apply(this);
-        this.polygon.destroy();
+        if(this.polygon) {
+            this.polygon.destroy();
+        }
         this.polygon = null;
     },