If any of the commands executed through "interpreter-exec" fails, the
"quiet" value is not restored for the interpreter.  This may result in
something like the following.

(gdb) interpreter-exec console rubbish
Undefined command: "rubbish".  Try "help".
error in command: "rubbish".

readline: readline_callback_read_char() called with no handler!
Aborted

The attached patch will handle the error more correctly.
-- 
balrog 2oo6