Allow :ensure to take a nil value again

Fixes https://github.com/jwiegley/use-package/issues/526

diff --git a/lisp/use-package/use-package.el b/lisp/use-package/use-package.el
index 7a09a3be1b292f109b957d556ac68e5349acdea9..bf9d1c82709fbf85e06da1aca253a5426f67720e 100644 (file)
--- a/lisp/use-package/use-package.el
+++ b/lisp/use-package/use-package.el
@@ -722,7 +722,7 @@ If the package is installed, its entry is removed from
       t
     (use-package-only-one (symbol-name keyword) args
       (lambda (label arg)
-        (if (use-package--non-nil-symbolp arg)
+        (if (symbolp arg)
             arg
           (use-package-error
            (concat ":ensure wants an optional package name "