bug#67196: M-: uses a wrong value of debug-on-error when it is nil.

[Andreas Schwab]

On Nov 25 2023, Alan Mackenzie wrote:

> My guess is that debug-on-error was originally a DEFVAR_BOOL, and at some
> stage it was extended to handle a list of conditions.  But for some
> reason eval-expression-debug-on-error was not extended in the same way.

There is no need to extend eval-expression-debug-on-error.  Just set it
to nil to let eval-expression use the value of debug-on-error as usual.

-- 
Andreas Schwab, schwab@linux-m68k.org
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