about set key

[lof <flyli3415@gmail.com>]

I want to set tab as hippie-expand hot key for text writing
so I write:
(defun my-indent-or-complete ()
  (interactive)
  (if (looking-at "\\>")
      (hippie-expand nil)
    (indent-for-tab-command)
    ))
(global-set-key [(tab)] 'my-indent-or-complete)

but there is a problem
when I want to use a command,
I hit M-x and then I donnot remember the command
before , I hit M-x s<tab> ,so that it can give me some options
but now it start hippie-expand , I cannot get the options
how could I prevent hippie-expand start when I input command?

thank you