scripts: createdataset: close tar file on completion to avoid createing tar...

scripts: createdataset: close tar file on completion to avoid createing tar files with missing null record

scripts/createdataset.py

@@ -53,4 +53,5 @@ if __name__ == "__main__":
 		tar.add(path, arcname=os.path.split(path)[-1])
 		os.remove(path)
 	os.rmdir(args.out)
+	tar.close()