Allow user input missing args when do check update <remote>

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
Refactor: parse po-helper.sh team options

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
Bugfix: clean before git stash pop

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>