(release-3007.14)=
Fix mac_brew_pkg.list_pkgs crashing or producing incorrect results when
Homebrew returns null values for cask metadata:
When the installed version of a cask is null (e.g. Homebrew cannot
determine the installed version), it is now reported as "unknown"
instead of raising an error.
When full_token is null, it is now filtered out so that None
is never used as a package name key in the returned dictionary. #68763