custom-theme-set-variables more resilient against removed libraries

* lisp/custom.el (custom-theme-set-variables): Don't bug out on
  settings that require a library that has been removed (bug#38843).

1 files changed, 4 insertions, 1 deletions

diff --git a/lisp/custom.el b/lisp/custom.el
index cc445fe765b..cee4589543e 100644
--- a/lisp/custom.el
+++ b/lisp/custom.el
@@ -1010,7 +1010,10 @@ COMMENT is a comment string about SYMBOL."
                set)
           (when requests
             (put symbol 'custom-requests requests)
-            (mapc #'require requests))
+            ;; Load any libraries that the setting has specified as
+            ;; being required, but don't error out if the package has
+            ;; been removed.
+            (mapc (lambda (lib) (require lib nil t)) requests))
           (setq set (or (get symbol 'custom-set) #'custom-set-default))
           (put symbol 'saved-value (list value))
           (put symbol 'saved-variable-comment comment)