package headers should have a minimum height so nav doesn't move

[donjo]

If you're browsing a package with a short or non-existent description clicking a tab that isn't tied to a specific package version, like the score tab, will cause the UI to shift around since the "published" content block is no longer displaying. The overall header should probably have a minimum height set to whatever the shortest possible header with a published date is.

[blackwatertepes]

Wouldn't it be better to keep the "published" content block across all tabs, instead of it disappearing?