BUG: s-git log show error message even it runs correctly.

```bash
➜ /workspaces/s-git/tmp (master) $ ../s-git log
[commit 690f3b39286d4d0d9223f9334649de21ef4ffb91]
mmessage:

test

Error: s-git your current branch 'master' does not have any commits yet
```
Also typo `mmessage`.