Uploader queue fix

gistfile1.js

uploader.after('uploadcancel', function () {
    // Uploader is currently only looking at two possibilities when
    // calling uploadThese(): if there's no queue or if the queue is in
    // progress. After cancelling if there are still items int he queue
    // everything works fine, but if there aren't any the queue stays
    // there stuck in an UPLOADING state. To fix that, remove the
    // queue object if empty
    if (this.queue && !this.queue.queuedFiles.length) {
        this.queue = null;
    }
});