don't translate error message and replace console log with exception

lib/OpenLayers/Layer/Vector.js

@@ -565,9 +565,8 @@ OpenLayers.Layer.Vector = OpenLayers.Class(OpenLayers.Layer, {
             
             if (this.geometryType &&
               !(feature.geometry instanceof this.geometryType)) {
-                var throwStr = OpenLayers.i18n('componentShouldBe',
-                          {'geomType':this.geometryType.prototype.CLASS_NAME});
-                throw throwStr;
+                throw new TypeError('addFeatures: component should be an ' +
+                                    this.geometryType.prototype.CLASS_NAME);
               }
 
             //give feature reference to its layer
@@ -827,8 +826,10 @@ OpenLayers.Layer.Vector = OpenLayers.Class(OpenLayers.Layer, {
      */
     getFeatureFromEvent: function(evt) {
         if (!this.renderer) {
-            OpenLayers.Console.error(OpenLayers.i18n("getFeatureError")); 
-            return null;
+            throw new Error('getFeatureFromEvent called on layer with no ' +
+                            'renderer. This usually means you destroyed a ' +
+                            'layer, but not some handler which is associated ' +
+                            'with it.');
         }
         var feature = null;
         var featureId = this.renderer.getFeatureIdFromEvent(evt);