Cardio after lifting can be beneficial due to your glycogen stores being depleted from lifting, thus most of what you are burning is stored fat.
Morning cardio holds fairly the same principles, in the fact that your glycogen stores are depleted and you should be burning stored fat. However, you are most likely in more of a catabolic state because of the length of time since your last meal (if you do it empty stomach). To help combat this, some will drink a protein drink and/or drink/take BCAAs or EAAs during/before cardio.
Regardless of the never-ending debate of when to do cardio, one thing holds true. If your goal is to 'cut' or minimize fat stores, cardio at any time is better than no cardio.
With a lot of things, try one way out for awhile and see how your body responds. Adjust, if needed, from there.