[emacs-w3m:13760] [emacs-w3m/emacs-w3m] Fixes for w3m-current-url = NIL, loading images from ext program (#92)

+ Several instances were found of string operations being performed on
  w3m-current-url without checking if the variable was a string.

+ When an external program calls emacs/emacs-w3m to open a URI that is
  an image, and emacs-w3m is configured to view that filetype
  externally, it still creates a new emac-w3m buffer.

  + This patch deletes the created buffer; however, wouldn't it be
    better never to create it in the first place?

  + That might not be possible because the way asynchronous processes
    need to be associated with a buffer, but even so the current
    situation needlessly makesthe new buffer a copy of the most recent
    emacs-w3m buffer.
You can view, comment on, or merge this pull request online at:

  https://github.com/emacs-w3m/emacs-w3m/pull/92

-- Commit Summary --

  * Fixes for w3m-current-url = NIL, loading images from ext program

-- File Changes --

    M ChangeLog (10)
    M w3m-proc.el (25)
    M w3m.el (11)

-- Patch Links --

https://github.com/emacs-w3m/emacs-w3m/pull/92.patch
https://github.com/emacs-w3m/emacs-w3m/pull/92.diff

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