checkout: print a message when switching unborn branches
When we switch to a new branch using checkout, we usually output a message indicating what happened. However, when we switch from an unborn branch to a new branch, we do not print anything, which may leave the user wondering what happened.
The reason is that the unborn branch is a special case (see abe1998), and does not follow the usual switch_branches code path. Let's add a similar informational message to the special case to match the usual code path.
Signed-off-by: Jeff King <firstname.lastname@example.org> Signed-off-by: Junio C Hamano <email@example.com>