bug#45333: complex command history should not save optional nil parameters

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> The advantage would be that the history is easier to navigate, because
>> you don't have to stare at all those nils when going through the list
>> looking for the command to execute.
>
> OTOH, you get to see all the optional arguments, which is also useful.
>
> It's a minor issue, to be sure.

Very minor, but on the whole, I think it makes for a slightly better
`command-history', so I've now pushed this to Emacs 29.  We'll see
whether there's any problems in this area...

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