Fixes issue with previous commit that references a nonexistent object.

src/extras/loaders/ColladaLoader.js

@@ -2231,9 +2231,10 @@ THREE.ColladaLoader = function () {
 		this.geometry3js.computeCentroids();
 		this.geometry3js.computeFaceNormals();
 		
-		if ( geom.calcNormals ) {
+		if ( this.geometry3js.calcNormals ) {
 			
 			this.geometry3js.computeVertexNormals();
+			delete this.geometry3js.calcNormals;
 			
 		}