#370 - fix issue when cancelling stored upload not yet triggered
#370 - fix issue when cancelling stored upload not yet triggered

SimonWaldherr/uploader,FineUploader/fine-uploader,FineUploader/fine-uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,FineUploader/fine-uploader