[m-rev.] For review: ensure proper initialisation of pretty_printer

[Ralph Becket]

Peter Wang, Tuesday, 27 April 2010:
> get_pretty_printer_is_initialised() ->
>   'ML_erlang_global_server' ! {get_mutable, t__mutable_variable_foo, self()},
>   receive
>     {get_mutable_ack, undefined} -> {no};
>     {get_mutable_ack, Value} -> Value
>   end.

Why is the 'no' in braces?
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