[commit] Don't internal error on user typos

[Joel Brobecker]

Hello,

> > 2006-11-17  Daniel Jacobowitz  <dan@codesourcery.com>
> > 
> > 	* utils.c (string_to_core_addr): Use error instead of
> > 	internal_error.
> > 	* mi/mi-main.c (mi_execute_command): Check for a NULL message.
> 
> Any objection to including this patch in the branch? I think
> the internal error is scarier than it should be, and might give
> the wrong impression about the debugger quality.

No objection, so I have checked this change in the branch.

-- 
Joel