Corrected all bugs

js/ProgressiveLoaderGeometry.js

@@ -111,6 +111,9 @@ ProgressiveLoaderGeometry.prototype.load = function() {
 }
 
 ProgressiveLoaderGeometry.prototype.getCamera = function() {
+    if (this.camera === null)
+        return null;
+
     return [this.camera.position.x, this.camera.position.y, this.camera.position.z,
         this.camera.target.x,   this.camera.target.y,   this.camera.target.z];
 }