There is an annoying issue when quiting cider in emacs 27.1 on
windows. The following puzzling error message is displayed to the
user with a loud bang:

error in process sentinel: Could not start nREPL server:

To reproduce with the minimum steps taken in emacs-27.1 under windows 10:

1. Create a deps.edn file with an empty {} dictionary as contents and open it in emacs.
2. Cider-jack-in-clj (C-c M-j); a connection to the REPL is opened.
3. cider-quit (C-c C-q) the repl.
4. above error message is displayed, there shouldn't be any errors since nothing has gone wrong.

The issue is caused by emacs bug #46284
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=46284 and only affects
27.1 (fixed in subsequent versions).

PR to follow.

;; CIDER 1.0.0 (Sofia), nREPL 0.8.3
;; Clojure 1.10.1, Java 11.0.7

GNU Emacs 27.1 (build 1, x86_64-w64-mingw32) of 2020-11-19

Windows 10