Warn when making a commit with 0 changes

[Reonu]

I keep forgetting to actually stage the changes and making commits with no changes at all. Maybe show the user a warning so that they can confirm if they're doing it on purpose?

[NostalgiaNinja]

Can an option be provided to stage all changes or cancel the commit so that we can stage the change when it happens? This would help with empty commits. (I had to make a duplicate commit as a result)

[perroboc]

A suggestion: Just a checkbox that allows empty commits. If empty commits are disabled, block the commit when no changes are staged.