How to "clean" minibuffer after a bug?

[Matiyam <matiyam@gmail.com>]

Hi!

Sometimes (II don't know exactly when, i 'll try to find out to fill the
corresponding bug report) the minibuffer doesn't clear aout after a
command.



I'll try to explain it:
- Somehow i get an error: "Command attempted to use minibuffer while in
minibuffer"
- After that, if:
- I press M-x
- The string "M-x " appears in the minibuffer, waiting for me to enter a
command name
- I press C-g to cancel
- The minibuffer, instead of clearing out, keeps saying "M-x ", or,
sometimes, "Quit"

In the *Backtrace* buffer the only error is:
Debugger entered--Lisp error: (error "Command attempted to use minibuffer
while in minibuffer")
  execute-extended-command(nil)
  call-interactively(execute-extended-command)

It's not really bad, just annoying. 

Is it there a way of restarting/reloading/clearing the minibuffer?

Thanks a lot for emacs!!!!

-- M