ahh the hell with this.
I'll just sum it up for you myself.
In the morning, your glycogen supplies are low from a long overnight fast, so while doing cardio work in the morning after this fast, your body is more likely to burn stored body fat for fuel.
Studies with these results have been made, however I would personally do whatever is more comfortable and convenient for you. If you are used to doing exercises in the early morning, then by all means this method may be for you. But if otherwise, then I don't think that it would make such a big deal to do it at a time more convenient for yourself.
Hope that helps.