eww-update-header-line: Possible breakage after d39ae6f5860ecf6ebbeedc08bf3aafa5befaf510

[T.V Raman]

eww-update-header-line has changed to apply variable-pitch to the
header as of d39ae6f5860ecf6ebbeedc08bf3aafa5befaf510.

This seems to work correctly when browsing Web sites, but it's
breaking in my ebook handler.

I'm setting eww-data correctly, and plist-get shows that :title is set
correctly in eww-data when I go to the buffer where the ebook is
rendered. However eww-update-header-line throws an error on this line:

+            (let ((title (propertize (plist-get eww-data :title)

  appears that  plist-get in the above call returns nil within
       eww-update-header-line --not sure why 
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♉ Id: kg:/m/0285kf1  🦮

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♉ Id: kg:/m/0285kf1  🦮