Clean up.

examples/js/loaders/ColladaLoader2.js

@@ -511,7 +511,7 @@ THREE.ColladaLoader.prototype = {
 
 				console.error( 'ColladaLoder: Undefined sampler', sid );
 
-				return;
+				return null;
 
 			}
 

src/textures/CubeTexture.js

@@ -19,9 +19,9 @@ THREE.CubeTexture.prototype.constructor = THREE.CubeTexture;
 THREE.CubeTexture.prototype.copy = function ( source ) {
 
 	THREE.Texture.prototype.copy.call( this, source );
-	
+
 	this.images = source.images;
-	
+
 	return this;
 
-};
+};
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