Fetching a newly created branch via bzr-git

[Eli Zaretskii]

I have a bzr repository that tracks an upstream git repository.  When
I created it, I used "bzr git-import", and after that I use "bzr
switch" to switch to some specific branch and "bzr pull" to sync that
branch with upstream.  So far so good.

Now a new branch was created in the upstream repository.  How can I
import that new branch, except by deleting everything and doing the
initial "bzr git-import" step again?

TIA