[6.x] Fixes issue for has_listeners method on dispatcher

[imanghafoori1]

Currently the has_listeners method on the dispatcher class is not able to detect the listeners with wildcards, but getListeners() method can detect and return such listeners.
I also added test to cover that.

And of course because the || operator is lazy in php, it does not go for execution of the closure in cases, the first two conditions are true.

The below code demonstrates that :

        Event::listen('foo.*', function () {
            //
        });
        Event::hasListeners('foo.bar'); // false
        Event::getListeners('foo.bar'); // returns closure !