🐞 Bug `crew upgrade` should not check for filelists in a fake package

[uberhacker]

$ crew upgrade
Updating packages...
core: Core Chromebrew Packages.
Performing pre-flight checks...
Removing since upgrade or reinstall...
Unable to remove package core as it does not have a filelist.
Core installed!
Packages have been updated.

[Zopolis4]

That's actually an issue in crew remove