Fix issue cocos2d#108 using fishcake's commit 256639c

Extensions/CCLayerPanZoom/CCLayerPanZoom.m

@@ -238,6 +238,14 @@ - (void) ccTouchesBegan: (NSSet *) touches
 - (void) ccTouchesMoved: (NSSet *) touches 
 			  withEvent: (UIEvent *) event
 {
+
+  // Fixes issue #108:
+  // ccTouchesMoved should never be called if ccTouchesBegan is not called first.
+  // However, when the scene is transitioning in, ccTouchesBegan is not called,
+  // causing self.touches to be empty, thus crashing the app due to an attempt
+  // to access an empty array.
+  if ([self.touches count] == 0) return;
+
 	BOOL multitouch = [self.touches count] > 1;
 	if (multitouch)
 	{