bug#5095: 23.1; emacsclient -t leaves terminal in an odd state if daemon not started

[Chong Yidong]

> If I start emacsclient like, without the emacs deamon already running:
>
> $ emacsclient -t
> or
> $ emacsclient -t <filename>
>
> and then press pagedown, emacs inserts the string "6~" into the buffer
> at point.

If there is no server present, you should get an error message like
this:

  emacsclient: can't find socket; have you started the server?
  To start the server in Emacs, type "M-x server-start".
  emacsclient: No socket or alternate editor.  Please use:

        --socket-name
        --server-file      (or environment variable EMACS_SERVER_FILE)
        --alternate-editor (or environment variable ALTERNATE_EDITOR)

Please provide a self-contained recipe for reproducing this bug.