bug#33503: 27.0.50; EWW error copyig URL

[Eli Zaretskii]

> From: Live System User <nyc4bos@aol.com>
> Date: Sun, 25 Nov 2018 13:29:59 -0500
> 
>         When clicking on "Copy Page URL" while viewing a webpage
>         using eww, I got the following error:
> 
> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>   string-match("\\`-+\\'" nil)
>   menu-bar-update-yank-menu(nil nil)
>   kill-new(nil)
>   eww-copy-page-url()
>   funcall-interactively(eww-copy-page-url)
>   call-interactively(eww-copy-page-url nil nil)
>   command-execute(eww-copy-page-url)

You mean, this happens every time you click on that button, no matter
what page is being displayed?  If so, I cannot reproduce this.  I
tried with 3 random Web pages, and none of them exhibited the problem.