Avoid killed-buffer reference on restart

[rfkm]

Current version of cider-restart seems to cause (wrong-type-argument stringp nil) error by trying to get name of killed buffer.

Stacktrace:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  propertize(nil face bold)
  cider-propertize-bold(nil)
  (message "Waiting for CIDER connection %s to quit..." (cider-propertize-bold (buffer-name conn)))
  (let ((project-dir (save-current-buffer (set-buffer conn) nrepl-project-dir))) (cider--quit-connection conn) (message "Waiting for CIDER connection %s to quit..." (cider-propertize-bold (buffer-name conn))) (sleep-for 2) (if project-dir (let ((default-directory project-dir)) (cider-jack-in)) (error "Can't restart CIDER connection for unknown project")))
  cider--restart-connection(#<killed buffer>)
  (if restart-all (let ((--dolist-tail-- cider-connections)) (while --dolist-tail-- (let ((conn (car --dolist-tail--))) (cider--restart-connection conn) (setq --dolist-tail-- (cdr --dolist-tail--))))) (cider--restart-connection (cider-current-connection)))
  cider-restart(nil)
  call-interactively(cider-restart record nil)
  command-execute(cider-restart record)
  helm-M-x(nil "cider-restart")
  call-interactively(helm-M-x nil nil)
  command-execute(helm-M-x)

[bbatsov]

Nice catch. Please, add a changelog entry in the "Bugs fixed" section.

[rfkm]

Done.

[bbatsov]

👍 Thanks!