bug#67764: 30.0.50; Opening image in eww no longer works

[Visuwesh <visuweshm@gmail.com>]

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[Monday December 11, 2023] john muhl via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

> In Emacs 29.1 the image opens as expected:
>
>   emacs -Q
>   M-: (eww "https://www.gnu.org/software/emacs/images/emacs.png")
>
> On master it fails with "Wrong type argument: stringp, nil".
> Bisect says 4254544 is the first bad commit.

Recent changes in shr-put-image didn't account for the possible nil
value for ALT.  Attached patch fixes the issue on my end.


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From f6d3fc0de572a1039e83df0389c1c7efce0ef0cf Mon Sep 17 00:00:00 2001
From: Visuwesh <visuweshm@gmail.com>
Date: Mon, 11 Dec 2023 17:09:03 +0530
Subject: [PATCH] ; Fix shr-put-image with nil value for ALT

* lisp/net/shr.el (shr-put-image): Account for nil value for ALT.
(Bug#6774)
---
 lisp/net/shr.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/net/shr.el b/lisp/net/shr.el
index 9f030b4c743..19c52ac8802 100644
--- a/lisp/net/shr.el
+++ b/lisp/net/shr.el
@@ -1137,7 +1137,7 @@ shr-put-image
         (when image
           ;; The trailing space can confuse shr-insert into not
           ;; putting any space after inline images.
-	  (setq alt (string-trim alt))
+	  (setq alt (string-trim (or alt "*")))
 	  ;; When inserting big-ish pictures, put them at the
 	  ;; beginning of the line.
 	  (let ((inline (shr--inline-image-p image)))
-- 
2.42.0