bug#60411: 29.0.60; minibuffer-next-completion skips first candidate when completions-header-format and completion-show-help are nil

[Gregory Heytings]

> For completeness, you may consider also handling the case where 
> completions-header-format is an empty string, which is another not too 
> unreasonable way to disable the header. minibuffer-next-completion still 
> skips the first candidate for that case.

Thanks for your feedback!  Indeed, that's another bug, which makes a fix 
elsewhere in the code even less likely.  It is fixed in the attached 
patch.  Can you try it?

Eli, do you have objections to that patch?

Fix-handling-of-completions-header-format.patch
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