Empty scripts, comments and search lists

Some users don't have any scripts yet, but an empty sorting table is shown.
Some users don't have any comments yet, but a pager is shown.
When search yield no results, an empty sorting table is shown.

This PR will add an message saying that this user doesn't have any scripts/comments yet, filling up the empty space. Also a message when there are no search results (scripts, libraries & users).
> Technically this is also used in scriptListPage

Can you elaborate where this (what's 'this' ?) is used also...