git plugin: fix ggl to avoid empty string see https://github.com/robbyrussell/oh-my-zsh/pull/2790#issuecomment-112716330
git plugin: fix ggl to avoid empty string
see
https://github.com/robbyrussell/oh-my-zsh/pull/2790#issuecomment-112716330

takady/oh-my-zsh,takady/oh-my-zsh,takady/oh-my-zsh