Added Error message when nothing staged.

[lemonlambda]

Errors and exits when you have not stagei anything with git.

(For Octoberfest)

[alt-art]

The code is not formatted, and the comparison will always be true because it will always return a response.
And you can use anyhow to send the message like this

return Err(anyhow!(
    "You have to stage your changes before committing, use `git add`"
));

[alt-art]

Tip: you need to verify the exit code number

[lemonlambda]

I have made the changes

[alt-art]

you need to format your code, use cargo fmt

[lemonlambda]

Done