Commit [810b20] Maximize Restore History

Provide more info in debugger-disabled-hook.

Before this change if there was an error printing the condition object,
then we didn't even try printing the backtrace afterwards, which can be
a useful source of information even if the condition printing has failed.

Some modifications by Paul Khuong.

Attila Lendvai Attila Lendvai 2010-10-31

Paul Khuong Paul Khuong 2013-06-28

changed src/code/debug.lisp
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