master 2e8212a: Fix problem with empty command histories in eshell and `erase'

[Lars Ingebrigtsen]

branch: master
commit 2e8212a56548d0de74c2f3c3abe72222368ae0c6
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Fix problem with empty command histories in eshell and `erase'
    
    * lisp/eshell/em-hist.el (eshell-add-input-to-history): Protect
    against an empty ring (bug#48770).
---
 lisp/eshell/em-hist.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/eshell/em-hist.el b/lisp/eshell/em-hist.el
index e559f5b..18e19a9 100644
--- a/lisp/eshell/em-hist.el
+++ b/lisp/eshell/em-hist.el
@@ -379,7 +379,7 @@ input."
              (if (eq eshell-hist-ignoredups 'erase)
                  ;; Remove any old occurrences of the input, and put
                  ;; the new one at the end.
-                 (progn
+                 (unless (ring-empty-p eshell-history-ring)
                    (ring-remove eshell-history-ring
                                (ring-member eshell-history-ring input))
                    t)