This avoids some ugly error messages and exceptions, and hopes that
some gnus method will display message/rfc822 parts that have only a
file, no :content part.
---
 emacs/notmuch-show.el | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 9a95eb34..7695e869 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -718,21 +718,23 @@ will return nil if the CID is unknown or cannot be 
retrieved."
   t)
 
 (defun notmuch-show-insert-part-message/rfc822 (msg part _content-type _nth 
depth _button)
-  (let* ((message (car (plist-get part :content)))
-        (body (car (plist-get message :body)))
-        (start (point)))
-    ;; Override `notmuch-message-headers' to force `From' to be
-    ;; displayed.
-    (let ((notmuch-message-headers '("From" "Subject" "To" "Cc" "Date")))
-      (notmuch-show-insert-headers (plist-get message :headers)))
-    ;; Blank line after headers to be compatible with the normal
-    ;; message display.
-    (insert "\n")
-    ;; Show the body
-    (notmuch-show-insert-bodypart msg body depth)
-    (when notmuch-show-indent-multipart
-      (indent-rigidly start (point) 1)))
-  t)
+  (let ((message (car (plist-get part :content))))
+    (and
+     message
+     (let ((body (car (plist-get message :body)))
+          (start (point)))
+       ;; Override `notmuch-message-headers' to force `From' to be
+       ;; displayed.
+       (let ((notmuch-message-headers '("From" "Subject" "To" "Cc" "Date")))
+        (notmuch-show-insert-headers (plist-get message :headers)))
+       ;; Blank line after headers to be compatible with the normal
+       ;; message display.
+       (insert "\n")
+       ;; Show the body
+       (notmuch-show-insert-bodypart msg body depth)
+       (when notmuch-show-indent-multipart
+        (indent-rigidly start (point) 1))
+       t))))
 
 (defun notmuch-show-insert-part-text/plain (msg part _content-type _nth depth 
button)
   ;; For backward compatibility we want to apply the text/plain hook
-- 
2.30.2
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