bug#17530: 24.4.50; `package-load-list': incorrect defcustom type

[Drew Adams]

> This has subsequently been fixed:
> 
> commit 9be8a2fb41043b4d4734a67f155d6923df10671b
> Author: Glenn Morris <rgm@gnu.org>
> Date:   Thu Jan 28 08:58:43 2016 -0800
> 
>     * lisp/emacs-lisp/package.el (package-load-list): Improve :type.
> 
> I'm therefore closing this bug report.

OK; good that the :type spec was fixed.

But at least in Emacs 26.3, the default is still
`(all)'.  For the record, this part of the problem
hasn't been addressed:

> If someone does not customize this or does
> `package-initialize' in their init file before
> loading `custom-file' then they might be in
> for an unwelcome surprise, depending on what
> packages they have locally.
>
> The default value would be better as nil, IMHO.