Output fix at upgrade when no packages to upgrade

When upgrading, if the only package to upgrade is a pinned package, the output looked like that:
```
==> Upgrading 0 packages, with result:

==> Not upgrading 1 pinned package:
<<package_name & version>>
```

The blank line is not beautiful. This commit fixes the output and replaces with:
```
==> No packages to upgrade
==> Not upgrading 1 pinned package:
<<package_name & version>>
```