emacs-29 3e349ee119: Fix error message when installing non-existent package

[Stefan Kangas]

branch: emacs-29
commit 3e349ee1198c7fc5187975c3e52e805a44f5b84b
Author: Stefan Kangas <stefankangas@gmail.com>
Commit: Stefan Kangas <stefankangas@gmail.com>

    Fix error message when installing non-existent package
    
    * lisp/emacs-lisp/package.el (package-compute-transaction): Don't add
    trailing dash to package name in non-existent package
    error.  (Bug#59923)
---
 lisp/emacs-lisp/package.el | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lisp/emacs-lisp/package.el b/lisp/emacs-lisp/package.el
index a9fd8c741e..4d33311cb7 100644
--- a/lisp/emacs-lisp/package.el
+++ b/lisp/emacs-lisp/package.el
@@ -1949,8 +1949,10 @@ SEEN is used internally to detect infinite recursion."
               (if (eq next-pkg 'emacs)
                   (error "This package requires Emacs version %s"
                          (package-version-join next-version))
-                (error "Package `%s-%s' is unavailable"
-                       next-pkg (package-version-join next-version))))))
+                (error (if (not next-version)
+                           (format "Package `%s' is unavailable" next-pkg)
+                         (format "Package `%s' (version %s) is unavailable"
+                                 next-pkg (package-version-join 
next-version))))))))
           (setq packages
                 (package-compute-transaction (cons found packages)
                                              (package-desc-reqs found)