cli: branch: print stats even if just one branch is updated

[yuja]

Extracted from #3967, with no code changes.

cc @ilyagr

Checklist

If applicable:

• [ ] I have updated CHANGELOG.md
• [ ] I have updated the documentation (README.md, docs/, demos/)
• [ ] I have updated the config schema (cli/src/config-schema.json)
• [ ] I have added tests to cover my changes

[jonathantanmy]

It makes sense to me to always print a message when a branch is deleted (and so on), but I'll let others give their opinion about the UX. The code change makes sense to me.